It’s tempting to ignore sleep in your efforts to pack more into the day. It’s true, you can train your body to survive on less sleep, but the long-term harm to your body is enormous. Aside from weakening your immune system and stamina, sleep deprivation damages your mental health.
Your mind has insufficient rest time to sort through the day’s events, categorise them and shelve them away in its library. Hopes, worries and fears you have been avoiding in your waking hours, which would normally be resolved in dream state, are ignored, and are free to fester in your mind, creating potentially larger problems.