Gotcha description

It's your first day, or rather night, of work at the museum! Here are your instructions:
1. Never fall asleep at your work post. NEVER!!!
2. All artifacts must be in their place, safe and sound.
3. You should be the only person in the museum! Remain vigilant!
4. If you notice anything suspicious, make sure to check it out!
5. If someone makes their way in, CATCH them!
Watch out for a guy with a sock on his head and a striped shirt with a penchant for stealing.

Most importantly, make sure to follow the rules, otherwise you’ll be fired!

P.S. If you suddenly spot something unusual, don’t be surprised, maybe it’s due to lack of sleep.
Good luck!