Thanks everyone for your replies.

Kate - I was hearing him cough from around 6.50am in the morning. Not earlier than that, and it was around the time I thought I heard him come home.

Anyway, I have decided to give DS the benefit of the doubt, "this time" I will definately be keeping a close eye on him and he knows that. I am truly hoping that DS isnt telling me a fib and that he was under his bed. DS is normally pretty good, and does well in school and everyone around him thinks the world of him, it just seems to be those teenage yrs. I guess for me I just was not expecting to not see him in his bed it was quite a shock especially at that time of morning. Thanks again everyone, I just really needed to get that vent out.