The way you put your bed and your bedroom has a big influence on how good you sleep and thus on how much energy you have for the day.
Vastu gives the following tips for bedrooms:
The master bedroom should be in the south west.  The best way to sleep is with your head to the south. Never sleep with your head to the north. Childeren and students can have there bed east west sleeping head to the east.

There are eight directions and according to Vastu each of these eight directions has his on influence on your wellbeing.