Sleeping problem

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Across
  1. 4. (noun or verb): something or someone that takes the place of something or someone else
  2. 6. (noun): a substance that you sometimes find in coffee, tea, and soft drinks that makes you feel more awake
  3. 7. of (quantifier): a lot of
Down
  1. 1. (noun or verb): a time of physical exercise to improve your fitness and health
  2. 2. (noun): a regular way of doing things
  3. 3. (adjective): impossible to describe in words, very bad
  4. 5. (noun): the power to do something hard for a long time