snoozer

noun3

1. •
   One who snoozes; a sleeper.
2. •
   (informal) Something that is boring, uninteresting or unremarkable; something that would tend to induce sleep.

   • The program is usually pretty good, but last Wednesday's episode was a real snoozer.
3. •
   (UK, no longer used) A thief who steals from hotel rooms while staying as a hotel guest.

   • […] a "snoozer," or one of those thieves who take up their quarters at hotels […] — 1862