Background
Postpartum depression (PPD) is a major depression that begins in or extends to the period after giving birth. It affects 10–15 % of all new mothers [
1,
2]. The consequences of depression in the postnatal period can be harmful for both mother and child since it can affect the mother-child relationship, the mothers’ self-esteem and her social and personal adjustment to her new role. Studies also show an impact on the cognitive and emotional development of the child [
3,
4].
Sleep and depression are closely related. It is known that up to 90 % of all persons suffering from major depression have symptoms of subjective sleep disturbances [
5]. Additionally, there is evidence that sleep alterations precede the onset of depression [
6‐
8]. It is well known that sleep changes during pregnancy with impaired quality of sleep, frequent nocturnal awakenings, fewer hours of sleep and lower sleep efficacy [
9,
10]. We also found that sleep disturbing conditions such as snoring and restless legs syndrome increase during pregnancy [
11,
12]. Restless legs syndrome (RLS) is characterized as paresthesia or dysesthesia, usually in the legs, causing a desire to move the limbs with immediate temporary relief by activity. The symptoms are aggravated at rest and in the evening or early night [
13], which might cause insomnia and insufficient sleep length. There is a known correlation between RLS and major depression in the general population [
14,
15]. A newly published paper indicates that women with RLS onset before pregnancy had an increased risk of both antenatal depression and PPD [
16], but there is no other evidence that RLS during pregnancy affects the prevalence of PPD.
There are a number of studies that show an association between sleep during pregnancy and depression or depressive symptoms before delivery [
17‐
19] and there is also a large survey describing an association between poor sleep quality postpartum and depression [
20]. A few studies have also explored the relationship between PPD and sleep during pregnancy, but they report diverging results and use different methods for measuring sleep associated factors [
21‐
25]. There is evidence that subjective perception of sleep, more than objective sleep quality is associated with postpartum depressive symptoms [
26,
27]; however this has not been evaluated using validated screening tools.
The aim of this study was to compare the frequencies of sleep related problems during pregnancy among women with the prevalence of depressive symptoms in the postpartum period. The sleep related problems considered were restless legs, daytime sleepiness, morning fatigue and snoring as measured by validated and convenient screening instruments.
Results
In total, 351 women answered the questionnaire about sleep in the 3rd trimester (mean gestational week 34.4, SD 0.6). Fifty-eight of the women (16.5 %) were not screened for PPD at postnatal check-up. The reasons for the drop-outs are shown in Table
1. These 58 women did not differ from the remaining women in terms of age, BMI, parity or prevalence of RLS and snoring. However, the women who were screened for PPD had higher scores on ESS during pregnancy (9.0 vs. 7.7,
p-value 0.017).
Table 1
Causes for absence of PPD screening
Non-attendance to postpartum check-up | 18 |
Attendance, but not screened for unknown reasons | 38 |
Othera
| 2 |
Total | 58 |
The 293 women who underwent screening for PPD (mean 9.2 weeks after giving birth, SD 5.8) were included in the statistical analysis. They had a mean EPDS score of 4.96 (range 0–22, SD 3.42). Twenty-nine women (9.9 %) had an EPDS score ≥10.
Medical and social data
Demographic and medical background data are shown in Table
2. No women claimed that they used alcohol or illegal drugs at inclusion in the study. Twenty-seven women had a history of any psychiatric disease before pregnancy, but none of them had suffered from psychotic disease. These women did not have significantly higher EPDS-score (Table
2). Women with previous PPD had an increased risk for high prevalence of postpartum depressive symptoms after their current pregnancy, however the confidence interval was very wide and the association was no longer significant when it was adjusted for background factors (Table
2).
Table 2
Background on studied women including unadjusted and adjusted odds ratio for EPDS ≥10
Age (years. mean/SD) | 30.1/4.28 | 29.9/4.95 | 0.822 | 0.99 (0.90–1.08) | 1.03 (0.94–1.13) |
Relationship status |
| Partnered | 261 | 98.9 | 28 | 96.6 | 0.308 | Reference | Reference |
| Single | 3 | 1.1 | 1 | 3.4 | | 3.11 (0.31–30.88) | 1.62 (0.14–20.52) |
Parity | Primi | 127 | 48.1 | 14 | 48.3 | 0.986 | 1.01 (0.47–2.17) | 1.26 (0.52–3.09) |
| Multi | 137 | 51.9 | 15 | 51.7 | | Reference | Reference |
BMI at start of pregnancy (kg/m2; mean/SD) | 24.0/3.92 | 24.0/3.60 | 0.792 | 1.01 (0.91–1.11) | 1.09 (0.46–2.55) |
| Normal | 182 | 69.7 | 18 | 62.1 | 0.397 | Reference | Reference |
| Overweight | 79 | 30.3 | 11 | 37.9 | | 1.41 (0.64–3.12) | 1.17 (0.51–2.70) |
Smoking |
| Yes | 11 | 4.2 | 1 | 3.4 | 0.853 | 1.22 (0.15–9.78) | 0.63 (0.07–5.48) |
| No | 253 | 95.8 | 28 | 96.6 | | Reference | Reference |
Education/occupation |
| High skill | 162 | 61.4 | 10 | 34.5 | 0.019 | Reference | Reference |
| Low skill | 63 | 23.9 | 11 | 37.5 | | 2.83 (1.15–6.99) | 3.11 (1.17–8.29) |
| Other/non | 39 | 14.8 | 8 | 27.6 | | 3.32 (1.23–8.97) | 3.08 (1.05–9.04) |
Any psychiatric disease prior to pregnancyb
|
| Yes | 22 | 8.3 | 5 | 17.2 | 0.115 | 2.29 (0.74–6.60) | 1.16 (0.29–4.63) |
| No | 242 | 91.7 | 24 | 82.8 | | Reference | Reference |
Previous PPDc
|
| Yes | 2 | 1.5 | 2 | 13.3 | 0.001 | 10.39 (1.35–79.94) | 5.91 (0.44–79.45) |
| No | 135 | 98.5 | 13 | 86.7 | | Reference | Reference |
Medical and social events during pregnancy and labour are presented in Table
3. These data were adjusted for all background data displayed in Table
2. Eight women experienced depression during their pregnancy, two of them had received this diagnosis already before becoming pregnant. One woman started taking anti-depressive medication during her pregnancy and four underwent non-directive counselling. Two women with EPDS score ≥10 had experienced stressful life events during their pregnancies, which were related to present or past relationships. All 18 women who stated that they were afraid of delivery underwent a special non-directive counselling for this. Of the 51 women who did not have a normal delivery, 17 were delivered with vacuum extraction, 20 with elective caesarean section and 14 with acute caesarean section. Only 19 women did not breast feed at all at the postpartum check-up, and the difference between the women with high vs. normal EPDS score was not statistical significant (OR = 1.095, CI 0.240–5.007) (data not shown). Since most of the analysed obstetric complications are rare, and the group with EPDS ≥ 10 is relatively small, the confidence intervals for many of the obstetric outcomes are large, indicating a statistical uncertainty.
Table 3
Pregnancy and delivery related data on studied women including unadjusted and adjusted odds ratio for EPDS ≥10
Depression during current pregnancy | Yes | 5 | 1.9 | 3 | 10.3 | 0.008 | 5.98 (1.35–26.42) | 8.81 (1.07–72.39) |
| No | 259 | 98.1 | 26 | 89.7 | | Reference | Reference |
Current antidepressive medication during pregnancyb
| | | | | | | | |
| Yes | 3 | 1.1 | 1 | 3.4 | 0.308 | 3.11 (0.31–30.88) | 1.71 (0.09–32.38) |
| No | 261 | 98.9 | 28 | 96.6 | | Reference | Reference |
Intercurrent somatic diseasec
| | | | | | | | |
| Yes | 13 | 4.9 | 2 | 6.9 | 0.647 | 1.43 (0.31–30.88) | 1.29 (0.25–6.28) |
| No | 251 | 95.1 | 27 | 93.1 | | Reference | Reference |
Stressful life event during pregnancy | | | | | | | | |
| Yes | 8 | 3.0 | 2 | 6.9 | 0.276 | 2.37 (0.48–11.73) | 2.03 (0.38–11.54) |
| No | 256 | 97.0 | 27 | 93.1 | | Reference | Reference |
Number of visits during pregnancyd(no of visits mean/SD) | 10.2/2.4 | 11.2/2.9 | 0.032 | 1.16 (1.01–1.32) | 1.16 (0.99–1.36) |
Fear of delivery | | | | | | | |
| Yes | 16 | 6.1 | 2 | 6.9 | 0.859 | 1.15 (0.25–5.26) | 0.89 (0.16–4.88) |
| No | 248 | 93.9 | 27 | 93.1 | | Reference | Reference |
Complication during pregnancye
| | | | | | | |
| Yes | 58 | 22,0 | 6 | 20,7 | 0.874 | 0.93 (0.36–2.38) | 0.74 (0.26–2.05) |
| No | 206 | 78,0 | 23 | 79,3 | | Reference | Reference |
Premature birth (<36 + 6)f
| | | | | | | |
| Yes | 3 | 1.1 | 3 | 10.3 | 0.001 | 10.04 (1.93–52.29) | 13.07 (2.08–82.26) |
| No | 261 | 98.9 | 26 | 89.7 | | Reference | Reference |
Normal delivery | | | | | | | |
| Yes | 221 | 83.7 | 21 | 72.4 | 0.128 | Reference | Reference |
| No | 43 | 16.3 | 8 | 27.6 | | 1.96 (0.81–4.71) | 1.84 (0.71–4.76) |
Complication during or after deliveryg
| | | | | | | |
| Yes | 33 | 12.5 | 4 | 13.8 | 0.842 | 1.12 (0.37–3.42) | 1.25 (0.39–3.94) |
| No | 231 | 87.5 | 25 | 86.2 | | Reference | Reference |
The mean ESS score in the entire group of women was 8.98 (SD 3.82). Women with normal EPDS score had mean ESS 8.83 (SD 3.79) and women with EPDS ≥10 had mean ESS 10.34 (SD 3.86). The difference between the groups was statically significant (p = 0.043). When defining daytime sleepiness as ESS ≥ 10, the sensitivity of this test for predicting EPDS ≥ 10 was 59 % and the positive predictive value 16 %. The specificity was 66 % and the negative predictive value was 94 %.
Sleep related data are presented in Table
4. These data are adjusted for the background data in Table
2 and also for the statistically significant variables in Table
3. The difference in daytime sleepiness was significant between the women with high vs. normal EPDS score, both defined as ESS score ≥10 and when asked as a yes or no question (“Do you feel tired and badly rested when you wake up in the morning?”). Also morning fatigue and restless legs in 3rd trimester of pregnancy showed significant association with high postpartum EPDS score, but not snoring during pregnancy (OR shown in Table
4).
Table 4
Sleep related data on studied women including unadjusted and adjusted odds ratio for EPDS ≥10
Excessive daytime sleepiness (ESS ≥ 10) | | | | | | | | |
| Yes | 91 | 34.5 | 17 | 58.6 | 0.010 | 2.69 (1.23–5.88) | 2.77 (1.23–6.23) | 3.84 (1.57–9.39) |
| No | 173 | 65.5 | 12 | 41.4 | | Reference | Reference | |
Daytime sleepiness | | | | | | | | |
| Yes | 75 | 30.1 | 15 | 57.7 | 0.004 | 3.16 (1.39–7.21) | 3.48 (1.42–8.49) | 3.29 (1.30–8.33) |
| No | 174 | 69.9 | 11 | 42.3 | | Reference | Reference | |
Morning fatiguec
| | | | | | | | |
| Yes | 58 | 22.1 | 14 | 50.0 | 0.001 | 3.52 (1.59–7.80) | 3.55 (1.50–8.42) | 3.17 (1.23–7.87) |
| No | 204 | 77.9 | 14 | 50.0 | | Reference | Reference | |
Habitual snoring | | | | | | | | |
| Yes | 52 | 20,0 | 6 | 23.1 | 0.710 | 1.20 (0.46–3.14) | 1.03 (0.95–1.16) | 0.98 (0.31–3.11) |
| No | 208 | 80,0 | 20 | 76.9 | | Reference | Reference | |
Restless legs symptoms | | | | | | | | |
| Yes | 75 | 28.4 | 14 | 48.3 | 0.027 | 2.35 (1.08–5.11) | 2.50 (1.09–5.71) | 2.84 (1.18–6.84) |
| No | 189 | 71.6 | 15 | 51.7 | | Reference | Reference | |
Discussion
This study shows an association between high prevalence of depressive symptoms in the postpartum period and high ESS score, daytime sleepiness, morning fatigue and restless legs symptoms in last trimester of pregnancy. There is evidence that disturbed sleep precedes depressive symptoms in the general population [
5] and that poor sleep quality in early pregnancy might contribute to antepartum depressive symptoms during pregnancy [
17]. Therefore it is likely that poor sleep already during pregnancy increases vulnerability for development of PPD. This is of importance as PPD is a common condition causing severe suffering for the new mother and her family, and all possibilities to prevent this is valuable. Almost all Swedish pregnant women have regular contacts with the ACC which enables regular screening for disturbed sleep, and information and counselling about good sleep as prevention for later depression. There is evidence that sleep educational programs might decrease postpartum depressive symptoms [
38]. A newly published Cochrane report regarding PPD [
39] appoints that interventions targeting women at risk are the most beneficial to prevent postpartum depressive symptoms.
In Sweden almost 100 % of all pregnant women attend the antenatal care program. The present survey constitute a large number of consecutively recruited women who were followed during and after pregnancy to avoid selection bias. However, there was a drop-out of 58 women (16.5 %) who never answered the EPDS which is a possible weakness in the study.
Validated instruments for measuring depressive symptoms (EPDS), sleepiness (ESS) and RLS were used. We intentionally chose to evaluate possible sleep disturbances by use of the ESS, despite the fact that this does not actually say anything about objective sleep. This is in line with results from previous studies, showing that the association between postpartum mood and the subjective perception of sleep is stronger than between postpartum mood and objective sleep quality and duration [
26,
27]. The use of a screening tool, only taking a few minutes to complete, might also contribute to a larger study population by making participation in the study more attractive for both women and their midwives. It might also make implementation of the results easier, since the same screening tool can be used in the clinic as part of the normal antepartum program. But, since poor sleep and tiredness might be symptoms of an already existing depression, it is possible that a high ESS score during pregnancy could actually indicate an antepartum depression.
The prevalence of EPDS ≥10 was 9.9 % among the women in our study, which is somewhat lower than in other research [
1]. On the other hand, the identified risk factors in this study for a high prevalence of depressive symptoms after delivery (low education level, previous PPD, depression during current pregnancy and high number of visits to medical staff during pregnancy) corresponds well with previous knowledge [
40]. We also found that women with EPDS ≥10 experienced more daytime sleepiness and morning fatigue than the other women. There are some smaller studies reporting similar associations between poor sleep quality during pregnancy and development or recurrence of PPD or postpartum depressive symptoms [
22,
23,
26]. Furthermore, there is a larger Portuguese study reporting association between insomnia in the last trimester of pregnancy and postpartum depressive symptoms, but not with PPD [
24]. However, none of these studies used a validated screening tool such as ESS for daytime sleepiness.
ESS might be a valuable screening tool to objectively verify daytime sleepiness due to sleeping problems during pregnancy. Our data suggests that high ESS scores during pregnancy also predict development of PPD. In our study, the sensitivity of ESS (cut off level ≥10) for predicting PPD was 59 % and the sensitivity was 66 %. This indicates that screening for daytime sleepiness during pregnancy can be a contribution, but not a perfect screening instrument for predicting PPD.
We also found that prevalence of RLS in last trimester of pregnancy is associated with depressive symptoms in the postpartum period, which confirms the association between RLS onset before pregnancy and both antenatal depression and PPD described by Wesström et al. [
16]. We found no association between snoring during pregnancy and postpartum depressive symptoms, although O'Brien et al. have reported maternal snoring as a risk factor for prenatal depressive symptoms [
41].
The major strength of this survey is its size and reliability. Our results do not clarify whether sleep disturbance or depressive symptoms occur first. If the women had completed the ESS and the EPDS both at the 3rd trimester visit and at the postpartum check-up this could have added extra strength to the study.
Abbreviations
ACC, antenatal care clinic; ESS, Epworth Sleepiness Scale; EPDS, Edinburgh Postnatal Depression Scale; PPD, postpartum depression; RLS, restless legs syndrome