Blocking Blue Light in Pregnancy, Effects on Melatonin Profile and Sleep

Condition(s) studied

Investigational drug(s) / intervention(s)

Blue-blocking glasses: Wear the BB-glasses from three hours before bedtime, and if needed to turn on the light, also during the night.

Light grey control glasses: Wear the light grey glasses from three hours before bedtime, and if needed to turn on the light, also during the night.

Study summary

Sleep disturbances are common in pregnancy, and the incidence increases during the third trimester. Light and specially the blue wavelengths of light, is affecting sleep and the circadian rhythm. The main aim of this randomized controlled study is to investigate the effect of Blue-blocking glasses (BB-glasses) used in the evening and night on sleep and mood in pregnant women in the third trimester. The outcome measures assess sleep variables, alertness, melatonin level, sleepiness (subjectively), mood and symptoms of anxiety and depression. In addition we want to measure the pregnancy related sleep problems, alcohol intake, physical activity and perceives stress in the study population, and the association with daily/nightly light exposure.

Eligibility

Primary outcome measure(s)

• Sleep diary — 3 weeks in the third trimester of pregnancy, mainly gestational week 28-31
  Daily subjective estimates of sleep variables, and will be assessed every morning.
• Change in motor activity measured by using Actigraphy. — 3 weeks in the third trimester of pregnancy, mainly gestational week 28-31
  Objective measure by Actiwatch Spectrum from Philips Respironics. The participants will use the Actiwatch for the whole study period of three weeks.
• Melatonin level — 3 weeks in the third trimester of pregnancy, mainly gestational week 28-31
  Measured by saliva samples.

Trial sites (1)

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