Never go to bed on a an argument.

This is an old saying that  may have some scientific  basis. Research showed its harder to  get back to  sleep if have  angry  thoughts. Due to fact that that  sleep reorganises information from short term  memory  to long term memory. A study involving  students  who  were  shown  negative images over 2 days, before and after a nights  sleep found their found  it harder to  shift bad thoughts on the 2 nd day.