Brain scans of smokers show that at night they experience light withdrawal symptoms. This causes a light disturbance of the sleep. Also nicotine makes it harder to fall asleep.
Forty middle-aged smokers participated in the tests. Of them 23% complained that they were still tired in the morning, against 5% of the non-smokers. The brain activity showed that smokers are lighter sleepers than the non-smokers.
The tested people had no other conditions that could effect the quality of sleep.
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