Daytime somnolence can also be produced by the carryover effect of bedtime hypnotics, and also by antihistamines, anticonvulsants, tricyclics, phenothiazines and some antihypertensives such as clonidine, prazosin, and beta-blockers.
Abruptly stopping long-term use of hypnotics, including alcohol, leads to rebound insomnia with intense worsening of sleep disturbances.
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