Chapter 6 · The Yoga of Meditation · Krishna said
Bhagavad Gita 6.16 — Avoid extremes
नात्यश्नतस्तु योगोऽस्ति न चैकान्तमनश्नतः। न चातिस्वप्नशीलस्य जाग्रतो नैव चार्जुन ॥
nātyaśnatastu yogo'sti na caikāntamanaśnataḥ | na cātisvapnaśīlasya jāgrato naiva cārjuna ||
Meaning
Yoga is not for one who eats too much or does not eat at all, Arjuna, nor for one who sleeps too much or stays awake too much.