The outset of "Schisms" sees Riker oversleep because of then-unknown experiments he was subjected to, so it's not surprising that he would forget to comb his hair before coming on duty. But why is his hair a mess for a most of the episode? Tired or not, he should have had time to comb his hair. It doesn't make sense that he would spend most of the episode looking out of sorts.
--Sran
--Sran