Can tiredness cause fever, drowsiness or sickness of any kind?

Last night my 2 year old went to bed about 10pm(ususal bedtime is 8:30-9:00pm) and woke up at 4am, stayed awake until about 6am (stayed in bed). I woke him up at 7am for daycare. While I was at work I got a call from the daycare and the sitter said my son was running a temp and he seems to be "out of it". She said it was like he just shut down, would not respond to her and very cranky. She said he reminded her of a person with Diabetes who need their meds and suggested that I take him to the hospital immediately.
He was not feverish when I picked him up so I took him home to monitor him. Before we could get home he was sleep and has been sleep for 2 hours already. I am going to take him to see his Dr. tomorrow, But my question is has anyone ever notice strange change in their child behavior from lack of sleep. Please comment and tell me what you think, seriously please.

First of all, I work at a day care center. In no way at all should they have told you about the diabetes thing. That was wrong. Secondly, he probably just has a virus, or is teething his molars *my son is 3 and is still teething molars*, and you can get mild fevers with the teething. Also may not want to sleep much from the pain. But that is my opinion and seeing that happen to tons of kids..probably nothing to worry about. Just give it time and see what happens. I mean take your child to the doctor but other than that I don't think you have to worry.

Yes, it happens, even with myself. When you have your child on this regular schedule and then one night the schedule gets messed up of course they are gonna be tired and cranky and maybe get a temp for awhile. If you have insur. it doesn't hurt to checked though.

Take your son to the emergency room or his doctor asap. A fever in a young child cannot be brought on by fatigue, and his other symptoms are worrisome.

Crankiness could definitely be brought on by lack of sleep, but non-responsiveness & fever cannot. I would have him checked as soon as you can. You can't gamble with a child that young - it could be nothing, but it could be something serious, espeically with so much going around at this time of year.

Good luck! Hope he's ok.