-being tired
-feeling crappy
-failing to check the microscope schedule apparently

(I just spent an hour setting up an experiment... when I was leaving, I saw that someone else was already signed up for 10-4... my experiment needs to run until 2 or 3

)
-wishing I could leave lab...
-but due to the above, having to hang around to talk to the person who's signed up for 10-4 to work something out