Stop sleeper stasis forcing unconsciousness

[TDHooligan]

Right now, any new medical staff can overestimate the strength of the sleeper and put someone in there for as long as you can brig someone.

This, combined with overzealous doctors keen to "fix your nicotine addiction" results in them regularly attempting to cram me into a sleeper against my will for my mandated 5 minute sleep sentence. 

Sleepers should be occupant-cancelable, especially considering how newbie doctors don't think twice about leaving you in one while you're in deep crit for 10 minutes.