If he has had a new prescription or had a change in meds it could be related. He may need a sleep study done. I had one done because I was dizzy all of the time and all the CT scans and ENT docs tests came out OK. The last result was a sleep study and now I sleep with a CPAP machine and all those icky symptoms are gone. I was not aware how many different sleep disorders there are, there are several. I tried to treat it with margaritas, but that didn't work either...darn it.