Srimad Bhagavatam Canto 06, Chapter 16, Text 55

SB 6.16.55

yena prasuptah purusah
 svapam vedatmanas tada
sukham ca nirgunam brahma
 tam atmanam avehi mam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Know Me to be the Supreme Brahman, the all-pervading Supersoul through whom the sleeping living entity can understand his dreaming condition and his happiness beyond the activities of the material senses. That is to say, I am the cause of the activities of the sleeping living being.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
When the living entity becomes free from false ego, he understands his superior position as a spirit soul, part and parcel of the pleasure potency of the Lord. Thus, due to Brahman, even while sleeping the living entity can enjoy. The Lord says, “That Brahman, that Paramatma and that Bhagavan are I Myself.” This is noted by Srila Jiva Gosvami in his Krama-sandarbha.
Srimad Bhagavatam Canto 06, Chapter 16, Text 53-54
Srimad Bhagavatam Canto 06, Chapter 16, Text 56