I am new to forge modding and whenever I try thread.sleep or some other form of it, it freezes the game instead of pausing the script. Does anyone know a way for this?

http://mcforge.readthedocs.io/en/latest/concepts/sides/

 

There are 2 threads (+2 network). You can't use sleep, it would put to sleep whole thread.

You need to make tick based counter - 20 ticks = 1sec.

To do that use TickEvent (@SubscribeEvent) - You want one of those subevents. Remember to honour event.phase!

More about forge events can be found in google.

 

Any questions - ask

 

P.S: It strongly depends "delay to what?" Very important so write what you want.