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You have to be at a certain exhaustion, 20 is default. It is located at the bottom left of the screen.

In the same file, you should see "Minimum exhaustion" change that to 0 as well.

Quote from cyllaz»

how do I disable fatigue in Somnia ??

In the config.

1.) Go to Roaming\.minecraft\config

2.) Scroll down till you see Somnia CFG

3.) Open, and you should see

fatigue {
S:displayFatigue=br
D:fatigueRate=0.00208
D:fatigueReplenishRate=0.00833
B:fatigueSideEffects=true
D:minimumFatigueToSleep=20.0
}

With the things that I have bolded, set D:fatigueRate=0.00208 to 0. Like this: D:fatigueRate=0

Then, make B:fatigueSideEffects=true. Erase true and set that to false.

Save it, and relaunch minecraft.