One verse

Srimad Bhagavatam 7.6.6

7.6.6

पुंसो वर्षशतं ह्यायुस्तदर्धं चाजितात्मन: । निष्फलं यदसौ रात्र्यां शेतेऽन्धं प्रापितस्तम: ॥ ६ ॥

pumso varsa-satam hy ayus tad-ardham cajitatmanah nisphalam yad asau ratryam sete ’ndham prapitas tamah

pumsah
of every human being
varsa-satam
one hundred years
hi
indeed
ayuh
duration of life
tat
of that
ardham
half
ca
and
ajita-atmanah
of a person who is a servant of his senses
nisphalam
without profit, without meaning
yat
because
asau
that person
ratryam
at night
sete
sleeps
andham
ignorance (forgetting his body and soul)
prapitah
being completely possessed of
tamah
darkness.

Every human being has a maximum duration of life of one hundred years, but for one who cannot control his senses, half of those years are completely lost because at night he sleeps twelve hours, being covered by ignorance. Therefore such a person has a lifetime of only fifty years.