yeah..just sleep =_= When I feel tired, i often doubt... I would doubt about almost everything in life... then i feel much more tired and even a little negative.. What a malicious feedback! It is obviously useless mind which is similar as disk fragments. computer will work slower within them. If I dont care or clean regularly, it will be more and more slow gradually. Maybe the most important thing i need to do when tired is just SLEEP... It will offer more ATP to each cell, as cleaning up the fragments. And I believe it will be faster when i restart the computer. Zzzzzzz