Helloqa During daytime sleep, REM sleep is more common which is a light sleep with autonomic hyperactivity which can cause increased heart rate, light headedness and other symptoms. Also there has developed an association between anxiety and daytime sleep, so you develop anticipatory anxiety, every time you try to sleep during the day.kindly consult a psychiatrist for proper evaluation before any treatment can be started.

Hey Such sensations could be a sign of underlying anxiety. Try progressive muscle relaxation before sleeping. If problem persists, consult a doctor.