You said sleeping in difficult hotels for 2 years.

I do not have much knowledge in this area (thanks Odee for mentioning other contexts for racing thoughts), but I do have general knowledge. Per the general knowledge, being off the sleep schedule (in all kinds of contexts - international travel back and forth for business, shift work, etc.) eventually will catch up to many people and may cause all sorts of mental health trouble that would never had manifested itself if not provoked by messing up with sleep severely.