Subjective sleep problems and sleep hygiene among adolescents having depression: A case-control study

Sleep research has often focussed heavily on polysomnography while ignoring subjective sleep complaints of individuals, especially the young ones. Discordance has been seen between objective and subjective parameters of sleep among children and adolescents. There has been a trend towards worsening of sleep hygiene among adolescents, which may predispose to psychiatric disorders like depression. So, we compared the subjective sleep quality and sleep hygiene among depressed and normal adolescents. A sample of 31 depressed adolescents and 32 healthy controls were compared on sleep parameters using Adolescent Sleep Wake Scale (ASWS), Adolescent Sleep Hygiene Scale (ASHS) and School Sleep Habits Survey. Depressed adolescents were found to have significantly worse sleep quality [ASWS score 3.72 ± 0.952 vs 4.79 ± 0.552, p < 0.001], longer sleep onset latency [68.23 ± 62.98 vs 19.53 ± 19.48 minutes, p < 0.001], and shorter sleep duration [414.19 ± 110.78 vs 498.28 ± 56.86 minutes, p < 0.001]. Sleep quality significantly correlated with depression severity (measured on Children's Depression Rating Scale- revised), i.e., higher the severity of depression, poorer was the sleep quality (r = -0.605, p < 0.01). But sleep hygiene was statistically similar between the two groups [ASHS score 3.21 ± 0.60 vs 3.36 ± 0.51, p = 0.293], and was inadequate (< 3.8) among all adolescents irrespective of depression. Hence, despite the lack of evidence from objective sleep measures, there seem to be subjective sleep impairments among adolescents having depression. Future research needs to address the underlying etiological factors and causal directions for depression and sleep impairments among adolescents. Sleep hygiene education must be a part of broader primary prevention strategies for psychiatric disorders.