Knocked out by air gel

I think I've figured out why I was feeling so drowsy last week. I bought an air fresh gel for the tiny office I work in for a couple of days a week. This was placed on a shelf and this particular shelf was only about 18 inches from my head. I think I was being "poisoned" by this because I've moved the position of it this week and haven't felt drowsy.......despite not getting to bed until 4am this morning.