A.M.
THis may or may not work but have them keep a note pad by their bed at night. YOu also. Tell them to write down their thoughts as they are going to be. This used to help me relax before going to bed. Now my kids run my energy out I am exhausted by bed time.
Are they exercising enough during the day? You could have them go for a walk or run after dinner. Just to help wind down all that energy.