Reference: Fataawa Ramadhaan – Volume 2, Page 522, Fatwa No.488
Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. – Fatwa No. 12901
Question: During Ramadhaan, if one was to take the pre-dawn meal (sahoor) and pray the Fajr prayer, then sleep until noon and prayed the Dhuhr prayer after which he would sleep until Asr, then pray the Asr prayer and, again, sleep until the time of breaking the fast [at Maghrib], would his fast be correct?
Response: If the situation is as mentioned, then his fast is correct. However, continuing in this fashion throughout the day (i.e. sleeping) is a waste and neglect on his part, especially since the month of Ramadhaan is a blessed month. It is befitting that the Muslim seek benefit from that which will aid him by reading the Qur.aan aplenty, working [for halaal earnings] and seeking knowledge.
And with Allaah lies all the success, and may Allaah send prayers and salutations upon our Prophet Muhammad ﷺ and his family and his companions.