upplementation of long-chain omega-3s, and DHA (docosahexaenoic acid) in particular, were associated with seven fewer wake episodes and longer sleep duration – 58 minutes more sleep per night – in a subset of children, according to a new study conducted at the University of Oxford in the United Kingdom. Additionally, higher blood levels of DHA may relate to better sleep among children based on parent-rated observations.
The paper titled, “Fatty acids and sleep in U.K. children: Subjective and pilot objective sleep results from the DOLAB study – a randomized controlled trial,” was recently published in the peer-reviewed Journal of Sleep Research. The randomized, placebo-controlled clinical trial and the observational analysis were a part of the independent study – DHA Oxford Learning and Behavior (DOLAB) study — initiated at the University of Oxford and funded by a grant from DSM Nutritional Products.
The DOLAB randomized, placebo-controlled clinical trial explored whether 16-week supplementation of 600 mg of DHA from algae per day verses corn/soybean oil placebo may improve sleep in a subset of children (n=362) aged 7-9 years recruited from mainstream schools in Oxfordshire, U.K. who were underperforming in reading. Additionally, the lead investigators assessed sleep patterns objectively in a random subgroup of 43 children by actigraphy (a non-invasive method of monitoring rest and activity cycles) and via sleep diaries completed by the children’s parents. The following variables were measured by actigraphy over five nights:
- Sleep onset and offset times
- Sleep duration in minutes
- Minutes awake between sleep onset and offset
- Sleep efficiency (total sleep time divided by time in bed)
- Sleep latency (minutes needed to fall asleep)
- Number of wakings after sleep onset
While the treatment trial did not show significant effects on sleep measures, as reported by the parent questionnaire (Child Sleep Habits Questionnaire – CSHQ), algal DHA supplementation did lead to an average of seven fewer wake episodes and 58 minutes of more sleep per night in the actigraphy subgroup of children.
Higher levels of DHA in the blood were significantly associated with better sleep, including less bedtime resistance, parasomnia and total sleep disturbance. Additionally, higher ratios of DHA and the long-chain omega-6 fatty acid ARA (arachidonic acid) were associated with less sleep disturbances.