Many people find that sleeping on their back is the best way to avoid developing back pain. However, this position often makes it difficult to achieve deep sleep. For optimal spine alignment, place one pillow underneath your head or neck and another underneath your knees when lying down.
Your brain keeps working hard even when you are fast asleep.
Goldfish can’t remember anything for longer than a second.
Goldfish actually have pretty good memories. They can remember things for months, not seconds like many people say.