Most likely, the Holy Spirit is absent if you're struggling with maintaining rest. One of God's promises is that you will find rest where his spirit is present. You're not alone in carrying the burdens of being overwhelmed and burnt out; take the rest of the Lord today.

Exodus 33: 14-16

14 And he said, My presence shall go with thee, and I will give thee rest.

15 And he said unto him, If thy presence go not with me, carry us not up hence.

16 For wherein shall it be known here that I and thy people have found grace in thy sight? is it not in that thou goest with us? so shall we be separated, I and thy people, from all the people that are upon the face of the earth.