Sometimes when falling asleep I feel like I'm falling. What's happening?
February 11, 2010 4:14 AM   Subscribe

Sometimes when falling asleep I feel like I'm falling. What's happening?

Sometimes when I'm just about to nod off my left leg shoots away like I'm suddenly falling. It's a real jolt that I'm getting and I'm wide awake with my pulse raging like mad after it happens. It's a thorough shock, like when you wake up and think "oh no, I fell asleep at the wheel" and realize you were sleeping in the drivers seat at some rest stop. it takes a second to figure out everything is in fact okay.

What's happening here? Is this muscle-related* or some kind of dream or something else entirely?

*=I do marathon training and quite presently run north of 80km/week but I'm not sore enough to have muscle spasms during the day.
posted by krautland to Health & Fitness (10 answers total) 2 users marked this as a favorite
 
Best answer: It's a hypnic jerk and I think nearly everyone's had them once or twice.
posted by Mizu at 4:18 AM on February 11, 2010


Previously, previously, previously (and there are more). This is one of AskMe's most popular questions, it seems...
posted by game warden to the events rhino at 4:28 AM on February 11, 2010


Yahoo Answers, first Google result for [feel like i'm falling when in bed].
posted by Jaltcoh at 5:32 AM on February 11, 2010


Yep, happens to just about everybody. Isn't it weird? I wonder if it's just a biological accident or if deep down there used to be some sort of ancient purpose to it.
posted by Cygnet at 7:18 AM on February 11, 2010


Huh, after further inspection, it appears that some people think that the hypnic jerk is a remant of the infantile Moro reflex, or startle reflex, to prevent falling. Can't find any good scientific papers about it though.
posted by Cygnet at 7:21 AM on February 11, 2010




Response by poster: once or twice... that made me laugh. I have those way more often than that.
posted by krautland at 8:34 AM on February 11, 2010


I think nearly everyone's had them once or twice.

understatement indeed!
l I had two last night. and one earlier in the week.. I seem to get them in waves at a time. Often when sharing a bed with a new partner I'll get them regularly for a few months. then they seem to mostly go away ie only one every 3-4 months or so.
posted by mary8nne at 8:35 AM on February 11, 2010


Oh, sure, I have them on a regular basis, but I was just covering my bases. I once described the sensation to a college roomie and she looked at me like I was completely nuts, until a semester later when she fell out of bed after a string of stressful biochem finals. After I was done laughing at her, she said "it's the thing! That you told me about! I didn't believe you!" But it never happened to her again that year. Lucky girl.
posted by Mizu at 9:17 AM on February 11, 2010


I've heard from a nutritionist friend that this may occur more frequently when you've got an iron deficiency. Might be an old wives' sort of answer though.
posted by ejoey at 11:33 AM on February 11, 2010


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