Stress is assumed to impair sleep, but there is very little empirical evidence for this using
sleep recordings. Here, we recorded sleep (at home) in 33 normal participants on three
nights, which followed days with low, high and intermediate stress. The participants made
daily ratings of the level of stress/worries at bedtime and also two-hourly ratings of stress.
Only those 16 individuals who differed in stress/worries between two nights were analysed.
There was a significantly lower sleep efficiency (81.0% versus 85.2%) a higher percent …