Hi
i had gone through your query.
It is due to environmental changes and adjust problem.
It will automatically restore soon.
follow
sleep hygiene to restore good and natural sleep.
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 coffee soft drink at night
Use bed when you feel sleepy,read up to when you will sleepy
No day time sleep
No talking or use mobile in bed
Calm and cool bed room
all of this will help you to restore good sleep
Besides this there are some medicines like benzodiazapine and zolpidame which are useful in treat sleep problems.
Thank you.
wish you a good health.