Bhagavad Gita 6.16

6.16 Verily Yoga is not possible for him who eats too much, nor for him who does not eat at all, nor for him who sleeps too much, nor for him who is (always) awake, O Arjuna.

There is no possibility of one’s becoming a yogī, O Arjuna, if one eats too much or eats too little, sleeps too much or does not sleep enough.