Do you have seasonal allergies? asthma? something which may have changed your breathing capacity? (you did mention getting sick) It may be unrelated, but you could also have a sleep disorder like apnea. If it doesn't go away when the cold subsides; go to a doctor, ask him if it makes sense, and get referred for a sleep study. Your insurance should cover it, and while it is horribly inconvenient to sleep with wires hooked to your scalp, it will give you an idea of what's going on. I started having sleep problems during class 3 years back, and after testing it turned out I had sleep apnea. Usually it's associated with weight gain though, not weight loss, however breathing problems can cause it too.