add the sleepless effect

instead of phantoms spawning when you don't get any sleep you could get the sleepless effect

after 3 sleepless nights you would get sleepless one which causes phantoms to spawn,

after 4 sleepless nights you would get sleepless two which causes phantoms to spawn and slows you a little,

after 5 sleepless nights you would get sleepless three which causes you to fall asleep even without a bed

and when you wake up you take two hearts of damage because your sore from sleeping without a bed.

the sleepless effect doesn't go away until you sleep in a bed.