One feels fatigue after walking a long distance, after dancing and after sexual activity. In this kind of fatigue there is dizziness, perspiration, inactivity of the limbs, yawning and very heavy breathing.
One day Yaśodā was chasing Kṛṣṇa in the yard after He had offended her. After a while, Yaśodā became very fatigued, and therefore she was perspiring, and her bunched hair became loosened. This is an instance of becoming fatigued because of working too much.
Sometimes all of the cowherd friends of Kṛṣṇa, along with Balarāma, danced together in some ceremony. At these times the garlands on their necks would move, and the boys would begin to perspire. Their whole bodies became wet from their ecstatic dancing. This is an instance of fatigue caused by dancing.
In Śrīmad-Bhāgavatam, Tenth Canto, Thirty-third Chapter, verse 20, it is said that after enjoying love affairs with Kṛṣṇa by dancing, embracing and kissing, the gopīs would sometimes become very tired, and Kṛṣṇa, out of His causeless mercy and compassion, would smear their faces with His lotus hands. This is an example of fatigue caused by laboring in the rāsa dance.