He wants to put the prayers together on a permanent basis because he works at night
Question

                I have got a job that requires me to work the night shift, and this means that I have to sleep during the day. Is it permissible for me to put Zuhr prayer together with ‘Asr, and Maghrib with ‘Isha’, on a permanent basis, so long as I have the night shift at work? I want to put them together so that I do not interrupt my sleep a great deal.
Praise be to Allah.
    What is required 
    is to regularly offer the prayers at the proper times, in obedience to the 
    command of Allah (interpretation of the meaning):

    “Guard strictly 
    (five obligatory) AsSalawat (the prayers) especially the middle Salat (i.e. 
    the best prayer Asr). And stand before Allah with obedience (and do not 
    speak to others during the Salat (prayers)).”

    [al-Baqarah 
    2:238]

    “Verily, the 
    prayer is enjoined on the believers at fixed hours”

    [an-Nisa’ 
    4:103]

    and so as to avoid 
    being included in the words of Allah (interpretation of the meaning):

    “Then, there 
    has succeeded them a posterity who have given up As-Salat (the prayers) 
    (i.e. made their Salat (prayers) to be lost, either by not offering them or 
    by not offering them perfectly or by not offering them in their proper fixed 
    times, etc.) and have followed lusts. So they will be thrown in Hell”

    [Maryam 19:59].

    Ibn Mas‘ood (may 
    Allah be pleased with him) said concerning al-ghayy (translated above as 
    “Hell”): It is a valley in Hell, very deep and with a foul taste. 

    And Allah says 
    (interpretation of the meaning):

    “So woe unto 
    those performers of Salat (prayers) (hypocrites),

    Who delay their 
    Salat (prayer) from their stated fixed times,”

    [al-Ma‘oon  
    107:4-5]. 

    So try hard to 
    wake up for the prayer; it will not matter if your sleep is interrupted, 
    because you will get used to that in the future. We do not know why you are 
    asking about putting Maghrib and ‘Isha’ together, because we cannot imagine 
    that you spend the whole day until ‘Isha’ asleep. Can you spend your life 
    only between work and sleep? What about paying attention to the rights of 
    your family and brothers, and doing acts of worship to Allah such as going 
    to the mosque, reading Qur’aan, seeking knowledge and so on? 

    We ask Allah to 
    help you and give you strength. 

    And Allah knows best.