Iblis has deceived some worshipers to perform a lot of night prayers. Some of them pray the entire night, and they feel happier when performing night and duha prayers more than obligatory prayers. Some fall asleep right before fajr and miss the obligatory prayer. Others wake up too lazy to work for sustaining their families.
I saw a Shaikh from among them named Husayn al-QazwinI walking a lot during the day in al-Mansur Masjid. When I inquired about this I was told that he does this so he does not fall asleep.
This does not conform with teachings of Islam or with sound intellect:
As for logic, the Prophet )sallallahu alaihi wasallam( said:
“Your body has a right over you, so wake up )when appropriate( and sleep )when appropriate( .“
]Abu Dawud, 1369[
And He )sallallahu alaihi wasallam( used to say:
“Adhere to moderate demeanor. Whoever arm-wrestles this religion will loose.”
]Musnad Ahmed 5/350, Hakim 1/312[
Anas, may Allah be pleased with him, said: “The Prophet )sallallahu alaihi wasallam( entered and saw a rope extended between two poles, he said:
‘What is this rope?’ They said: ‘it is a rope of Zainab, when she feels tired she hangs unto it.’ The Prophet )sallallahu alaihi wasallam( said:
‘Untie the rope, you should work actively until you feel tired, then you should rest.”‘
]Bukharee 3/278[
And Allah’s Messenger )sallallahu alaihi wasallam( said:
“If one of you feels sleepy then he should lie down until he is no longer sleepy. Because if he prays while he is sleepy he might curse himself )mistakenly( instead of seeking forgiveness.”
]Bukharee 1/271, Muslim 786[
As for the sound intellect:
Sleep re-energises a person, so when a person repells it, this might harm his body and mind.
So we seek refuge with Allah from ignorance.
If someone says: But we were informed that members of the Salaf used to pray at night?
We say:
those individuals were gradual in doing so. They made certain not to miss fajr prayer and to take a nap during the day. They also did not eat much, so this worked out well for them. It was not reported to us that Allah’s Messenger )sallallahu alaihi wasallam( stayed awake an entire night. His Sunnah is more worthy of being followed.
Some of those falling for Iblis’s deception try to insinuate to others that they were up praying last night. So they would say: So and so, the Adhan giver, gave adhan on time.
If this person did not intent to show-off then he has made public his action, which will result in reducing his reward.

]Talbees Iblees by Imam Ibn al-Jawzi, page 240-242]