Hi. I had gone through your query. You have irregular sleep wake cycle. Sleep hygiene method can help to restore normal sleep pattern. Certain routines and lifestyle modification will help you like Fix sleep schedule and stick on it No day time sleep Exercise that makes you fatigue Stress free activities and meditations Avoid alcohol and smoking Avoid heavy meal in dinner Avoid tea cofffee soft drink at night Use bed when you feel sleepy Read upto when you will sleepy No talking or use mobile in bed Calm and cool bed room All of this will help you to restore good sleep. Go for psychological screening because psychological stress also can lead to sleep problem.so treatment of it will resolve it. Doxylamine can not help much. Benzodaizapine or zolpidam are useful for insomnia but take doctors advise before taking any medicines. I hope i have answered your query. Thank you.