Bhagavad Gita 6.16 Chapter 6, Verse 16

नात्यश्नतस्तु योगोऽस्ति न चैकान्तमनश्नतः ।
न चातिस्वप्नशीलस्य जाग्रतो नैव चार्जुन ॥६.१६॥

nātyaśnatastu yogo'sti na caikāntamanaśnataḥ
na cātisvapnaśīlasya jāgrato naiva cārjuna

Meaning

Yoga is not for one who eats too much or not at all, O Arjuna, nor for one who sleeps too much or stays awake too long.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 6.16 (Chapter 6, The Yoga of Meditation (Atma Samyama Yoga), Verse 16)