Stretching not only increases your flexibility and joint mobility but also your neurological system. When we stretch, certain muscles in our body tend to relax while others contract. This contract/relax reaction is regulated by our brain which simultaneously sends out messages to the body to regulate the heart rate and blood pressure. Stretching also releases certain hormones to help control your bodies insulin levels, mood, emotion and metabolism. Try stretching 5-10 minutes before bed to help improve flexibility and to aid a restful sleep. Bodyism Flexibility section has a list of specific dynamic and static flexibility exercises.