dhyānayoga - Verse śloka 16
śloka 16
nātyaśnatastu yogo'sti na caikāntamanaśnataḥ |
na cātisvapnaśīlasya jāgrato naiva cārjuna ||6-16||
Translation
But, O Arjuna! This Yoga is not possible for him who eats too much or eats nothing at all, nor for him who sleeps too much or stays awake always.