My father had near fainting episode. can he take aricept before bed instead of in morning? to sleep

Absolutely. Aricept is usually taken at bedtime.

from http://www.drugs.com/aricept.html

How should I take Aricept?

Take Aricept exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

If you need to have any type of surgery, tell the surgeon ahead of time that you are taking Aricept. You may need to stop using the medicine for a short time.

Aricept can be taken with or without food or milk.
Take the Aricept regular tablets with a full glass of water.

To take donepezil orally disintegrating tablet (Aricept ODT):

*Keep the tablet in its blister pack until you are ready to take the medicine. Open the package and peel or cut the backing from the tablet blister. Do not push a tablet through the backing or you may damage the tablet.
*Using dry hands, remove the tablet and place it in your mouth. It will begin to dissolve right away.
*Do not swallow the tablet whole. Allow it to dissolve in your mouth without chewing.
*Swallow several times as the tablet dissolves. After the tablet dissolves completely, drink a glass of water.

Aricept is usually taken at bedtime. Follow your doctor's instructions. Store Aricept at room temperature away from moisture and heat.