A recent study looked at how placebo sleep affects cognitive function. Participants analyzed in the study were told that quality REM sleep constituted between 20-25% of their total sleep. One group was told that 28.7% of their sleep was in REM sleep and the other group was told that they were spending 16.2% in REM sleep during the night. The participants who were told that they had above normal quality sleep, 28.7%, scored significantly higher on the PASAT, a measure of cognitive function that specifically assesses auditory information, and the COWAT, a cognitive test of verbal processing ability, compared to participants who were told they had below average REM sleep.
The perception of how well you sleep might have an effect on how well you perform. Placebo sleep suggests that regardless of the quality of sleep, believing you had quality sleep can influence cognitive function. Talking of how tired you are can also negatively affect your ability to perform.
Some tips for a good night sleep
- Sleep in a dark room that is slightly cool
- Turn off all your technology (cell phones, computers, etc.)
- Avoid consuming caffeine late in the day; ideally not after lunch
- Seek out morning light. Sunlight in morning helps the body’s internal biological clock reset itself each day.
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