Complex sentence: Daytime symptoms can occur after a few days to a few weeks of administration of nightly benzodiazepine use or z-drugs such as zopiclone; withdrawal-related insomnia rebounds worse than baseline even when benzodiazepines are used intermittently.
Split into simpler sentences: Daytime symptoms can occur after a few days to a few weeks of administration of nightly benzodiazepine use or z-drugs such as zopiclone. The withdrawal-related insomnia rebounds worse than baseline even when benzodiazepines are used intermittently.