Nothing beats long hours of good sleep.
When I came home after my exam yesterday, at around 6 p.m., I decided to rest a bit, before I start studying again for another exam on Monday. I switched on the TV and laid my back on the folding bed in the living room. I was contemplating on trivial things like insurance quotes and ziplines and strawberry fields. I was looking back on what-ifs. I was daydreaming... then I was already sleeping.
Now, it's 9 a.m. And I just woke up. =) It's nice to have once and a while a good, quiet, LONG rest. It's like your starting on a clean slate. Good morning!