One feels fatigue after walking a long distance, after dancing and after sex activity. In this kind of fatigue there is dizziness, perspiration, inactivity of the limbs, yawning and very heavy breathing.
One day Yasoda was chasing Krsna in the yard after He had offended her. After a while Yasoda 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 Krsna, along with Balarama, danced together in some ceremony. At these times the garlands on Their necks would move, and They would begin to perspire. Their whole bodies became wet from Their ecstatic dancing. This is an instance of fatigue caused by dancing.
In Srimad-Bhagavatam, Tenth Canto, 33rd Chapter, 20th verse it is said that after enjoying love affairs with Krsna by dancing, embracing and kissing, the gopis would sometimes become very tired, and Krsna, 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 rasa dance.
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