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Best SLEEP! Alternatives
Here are some Firefox add-ons that are similar to SLEEP!:
Simple Site Blocker
b4rtaz
1 3.00 
(2) 
Site Time Limit
Mxim554
1 0.00 (0) 
It's Dream Time
Nexter
2 0.00 (0) 
Screen Time Locker
Frederic
1 0.00 (0) 
NoScroll - Stay Focused
NoScroll
4 0.00 (0) 
TimeBlock
Shreya
29 0.00 (0) 
Dawdle Block
Eero Lehtinen
14 4.90 (10) 
Website Blocker
Innovative Extensions
16 1.00 (1) 
Time Lock Blocker
Waddles127
10 0.00 (0) 
SiteBlocker: Easy Blocking and Scheduling
LionByte Software SRL
63 0.00 (0) 
BlocksEverything
vigneshmvgs
- 0.00 (0) 
Focus Block
oscar370
1 0.00 (0)