In this week’s Medical Discovery News by UTMB professor emeritus Norbert Herzog and professor David Niesel: Hypersomnia causes symptoms such as difficulty waking up from a long sleep, an increased need for sleep during the day even when working or engaged in a task, no relief from daytime naps, and a pattern of sleeping 14-18 hours per day. Hypersomnia is different from narcolepsy in that it does not come on suddenly and patients do not fall completely asleep, but function in a half-awake state. It is also quite rare.