Sleeping on a futon couch

I have a very expensive and comfortable bed in my bedroom upstairs but
upstair is colder than downstairs and I don't like the heater on at
night because it gets hot. I don't like comforter and I like to have
weight form blankets on my body. I use a handwoven wool blanket on
top of my quilted cotton bedspread and then another layer of velour
blanket on top of my wool blanket.

I usually use a little portable heater
(http://www.todaysconcept.com/holmes-hfh2986-electric-heater-fan.html)
in my bed next to my pillow to get the chill out of the bed sheets but
lately I ended up liking the heat such that I am qeezing that little
heater under the covers next to me so that the heat stays inside this
enclosure. Of course, the bedsheets gets too hot and it's not wise to
play with fire even though this unit seems quite safe:
http://www.todaysconcept.com/holmes-hfh2986-electric-heater-fan.html

I have a really nice futon - the most expensive one - that I bought 3
years ago but not used the first 2 years. It is very comfortable to
sleep in because the room temperature downstairs in this house where
this futon is kept is just perfect (with no heater on at night) for
summer time and with a wool blanket in winter.

I never unfold the futon from couch position because it's hard for me
to put it back to couch position. Sometimes I ended up falling aslep
when watching tv at night but I moved to my bed when I woke up in the
middle of the night. So I am sleeping in a position where half of my
body vertically is not ont he same plane as the other.

Last night, I decided not to move to my bed because I don't like
turning on that portable heater. Direct heat on my upper body gets my
nose dry.

I am wondering whether sleeping on that futon couch in such a slanted
position can have any medical complication.

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