Muang Kalasin police were alerted to the death of Noppadol Thanomphut, 46, at 6am.
Police said his wife found Noppadol hanging from a tamarind tree behind the factory in Ban Dong Sawang village in Tambon Huay Pho.
The wife said Noppadol woke up at 3am when there was a power outage and walked out of the bedroom.
She said that when she found her husband she called for neighbours to help bring him down but he was already dead.