Is my ADF sick??????????

my ADF's do that all the time, but they swim around at night tho. ADF's like to breathe atmospheric air (in this case the air in my room). i read somewhere it is either there isn't enough oxygen in the water or something else...can't remember but i am not certain if tht's the cause for the behavior. is it floating in that "zen" state that ADF's are famous for?