We spend a good chunk of our 24 hour day sleeping! We should pay attention to certain key things so we sleep well and awaken with less chance of being achy from using poor sleeping positions.
Pillow should support the head and neck so that the neck maintains alignment.
Mattress should not be so soft that your body sags down or so hard that your body is under stress. Again, the whole body should maintain alignment.
Make sure you have corrected these things for a good night's rest and ready to face the day!