What happens if you take 5 sleeping tablets?

4 X 0.25mg = Slighly calm and maybe a little dizzy, high/drunk and sleepy.

4 X 0.5mg = Good high, lasts all day, if you can take the sedation. (Recommended)

4 X 1mg = You will start feeling very sedated, amnesic and quickly will sleep.

4 X 2mg = You will enter a moderate comatose state, that can last up to 3 days.

I don't really recommend taking more than 3mg at once, it is not fun to take more than that. Unless you really like sleeping heavily, like a baby.