A physics teacher stretches out for a nap on a bed of nails.  How is this possible?
494083
the closer the nails are together, the less weight is placed on each nail.  more nails = less pain
1029618
The nails could get loose and you burn your finger by hanging for to long.
406343
it's heat absorbed or radiated during a change of a phase at constant temperature/pressure.
1117127
YOur eyes are closed.
1061796
the comforter and the teacher
239367
They are not getting enough sleep.\n\nSee these links.
54803
Haha I remember doing this one.\n\nTake one nail and lay it horizontally across the table. Then, lay the other nails across it, with the flat part of the nails being close to eachother and the horizontal nail.  Alternate the direction of the nails... place them on either side... (sorry this is a really bad explaination) and then take the last nail and lay it across so it makes a 'sandwich' with the horizontal nail.  Pick up the entire thing and balance it on the nail sticking out of the wood.  \n\nI hope you can figure that all out!
431240
oh this has been awhile....ok a block of wood, a couple nails, some tape, some wire, and a six? volt battery.\n\nyou are basicaly making one of the nails an electro magnet so that when the circuit is completed it comes on and pulls down one of the wires to the top of it making a clicking noise, open the circuit the wire will spring back up.  \n\nhere is a more complicated one that will send to another one\nhttp://www.apluschilddev.com/headstart/services/projects/easy_make_telegraph.htm
269142
someone with too much time on their hands ... or an academic pack rat
530497
She might just be half asleep.  People ask for weird things when they're not awake.  Or maybe a neighbor is playing loud music that she can hear and just assumed it was you?  I've done things like that to my parents before (asked them to turn down the TV and it turned out there were just people talking loudly in the yard of the house next door).\n\nIf there's really no music, and she's fully awake, then it might still be nothing, but it could also be a symptom of a physiological or neurological problem.  Is it a normal time for her to sleep? (I don't know what time zone you're in).  Has she been acting odd lately?  Sleeping more or less than normal, talking to herself, anything like that?  If so, she should probably see a doctor.  But if there's nothing else going on, and it's just this one time thing, it's probably no big deal.
785489
Try having a snooze under your desk.
263849
well my teacher last year sprayed static guard in her hair.\ngive that a try.or you could use a kind of mouse or stlying cream.
790170
Go to the school nurse and ask if she has maybe a heat pack to put over the area and if you can lay down for a while.  She/he should sympathize!  Good luck!
1166300
To keep her bed from falling apart
842182
Perhaps she is just a person who likes the curtains closed and while she's in there, it's HER classroom and she's in charge.  Also maybe she doesn't want the students looking off outside and daydreaming or being distracted while she's teaching?  Dunno for sure though.
890700
Lol, I think that's what teachers are suppose to do. My teachers do that all the time...\n\nwhy? Is this teacher hot as hell?
1070885
One idea:  Fingernails-on-blackboard: it sounds exactly like the destruction of tooth enamel. We're instinctively programmed to respond instantly.\n\nIt's the sound of body damage; but it's a particular type of body damage for which there is no pain ...yet no healing.