Every evening at sunset Kṛṣṇa used to return from the pasturing ground where He herded cows. Sometimes when Mother Yaśodā could not hear the sweet vibration of His flute she would become very anxious, and because of this she would feel dizzy. Thus, dizziness caused by anxiety in ecstatic love for Kṛṣṇa is also possible.
When Yaśodā had tied Kṛṣṇa up one time, she began to think, "Kṛṣṇa's body is so soft and delicate, how could I have tied Him with rope?" Thinking this, her brain became puzzled, and she felt dizziness.
The gopīs were advised by their superiors to bolt the doors at night, but they were so carefree that they did not carry out this order very rigidly. Sometimes, by thinking of Kṛṣṇa, they became so confident of being out of all danger that they would lie down at night in the courtyards of their houses. This is an instance of dizziness in ecstatic love due to natural affection for Kṛṣṇa.
It may be questioned why devotees of Kṛṣṇa should be attacked by dizziness, which is usually considered a sign of the modes of ignorance. To answer this question, Śrī Jīva Gosvāmī has said that the devotees of Lord Kṛṣṇa are always transcendental to all the modes of material nature; when they feel dizziness or go to sleep, they are not considered to be sleeping under the modes of nature, but are accepted as being in a trance of devotional service. There is an authoritative statement in the Garuḍa Purāṇa about mystic yogīs who are under the direct shelter of the Supreme Personality of Godhead: "In all three stages of their consciousness—namely, wakefulness, dreaming and deep sleep—the devotees are absorbed in the thought of the Supreme Personality of Godhead. Therefore, in their complete absorption in the thought of Kṛṣṇa, they do not sleep."