Ibn al-Qayyim (may Allah have mercy on him) said: A man’s time is in fact his life, and his eternal life, whether it is eternal bliss or eternal suffering, is based on how he spent it. Time is passing quickly; whatever time he spends for the sake of Allah and by the help of Allah, this is his true life; any other time is not counted as part of his life, even if he spends it doing what animals do. So if he spends his time in heedlessness, idle entertainment and false wishes, and the best of what he spends his time in is sleep and idleness, then his death is better than his life.

Al-Jawaab al-Kaafi, p. 109