coincidence or does heat really affect sleep?

i turned our heat up to 66 last night. i thought i would increase it a few degrees at a time to see where asher liked it best. he's sleeping pattern the past few weeks has been:
asleep between 7-8
wake at 12 or 1 to nurse and change and back to sleep within 30 minutes
wake at 3ish
wake at 4ish
wake at 5ish, unless i have already brought him unto bed...if i haven't, i do now.
steve will take him around 5:30-6:30 for a bit and then bring him back upstairs to our bed to sleep from 7:30-9ish with me.

last night he slept from:
7:20-12:45 (nursed, changed and back to bed by 1:20)
woke at 4:45 (i brought him into bed because i was too tired to nurse him sitting up!)
at 6:30 steve took him downstairs to play and then brought him back up at 7:30.
slept with me from 7:30-9:15! wowza!!!

i hope this lasts! i like this sleeping pattern much better!! thanks for the advice ladies!!!