i was sleeping on sheets and a comforter on a carpet floor for a month. i fell out of my morning exercise routine for that month. i got a new mattress and i'm sleeping much better. i get up earlier and i'm back into the morning jog on the beach and i feel much much better for the whole morning on those days. i didn't realize how much it was affecting me. i was sleeping the whole night and didn't wake up particularly tired except for the fact that i just couldn't get up in time to exercise. i thought it was laziness or not getting to bed early enough.
while the mattress is a big improvement, its still a crappy mattress. i hope to switch it out sometime.