Ibn Abbaas RadhiAllaahu Anhu narrates,

“Whilst Rasulullaah SalAllaahu Alayhi Wasallam was delivering a sermon, he saw a man standing. So he asked about him.
The Sahaabah RadhiAllaahu Anhum said, ‘He is Abu Israa’eel. He took a vow that he will stand in the sun. He will neither sit, go in the shade, nor speak, and that he will fast forever.’
Rasulullaah SalAllaahu Alayhi Wasallam said, ‘Go and tell him that he should speak, go in the shade, sit, and complete his fast.’”
(Bukhaari no. 6704)

Aa’ishah RadhiAllaahu Anhuma narrates that Rasulullaah SalAllaahu Alayhi Wasallam came to her when there was a woman with her.
He asked, “Who is this?” She replied, “This is so and so.”
Aa’ishah  RadhiAllaahu Anhuma then spoke about how much of salaah she offers [and how devoted she is in her acts of worship].
Rasulullaah SalAllaahu Alayhi Wasallam said, “Desist [from all that]! You should only do what is within your capacity. By Allaah! Allaah continues giving reward [and never gets tired] but you will become tired. The most beloved obedience in His sight is that which the person steadfastly adheres to.”
(Bukhaari 43/1151, Muslim 785)

Rasulullaah SalAllaahu Alayhi Wasallam said, “The religion [of Islam] is easy. The person who imposes [undue] hardships in religious matters over himself, they [the religious matters] will overwhelm him [and he will not be able to fulfil them]. You should therefore remain moderate, do as much as you possibly can, and rejoice [over the reward for good deeds that are steadfastly performed]. Seek help [in fulfilling acts of worship] in the morning, the evening, and in the latter part of the night.”
(Bukhaari no. 39)

Another narration states: “Remain moderate, and do as much as you possibly can. [Fulfil acts of worship] in the morning, the evening, and in the latter part of the night. Remain moderate, remain moderate, and you will reach your goal.”

This means that you should take advantage of the appropriate times for the remembrance of Allaah Jalla Jalaalahoo by doing good deeds when you are fresh and your heart is clear [of all worries and tensions]. In so doing, you will enjoy your worship, you will not become bored, and you will reach your goal.

This is similar to an experienced traveller who travels during these times, and takes a rest, along with his conveyance at other times. In so doing, he reaches his destination without any fatigue. And Allaah Jalla Jalaalahoo knows best!

Once Rasulullaah SalAllaahu Alayhi Wasallam entered the masjid and saw a rope tied between two pillars.
He asked: “What is this rope for?”
The Sahaabah RadhiAllaahu Anhum replied, “Zaynab tied this rope. When she gets tired [after engaging in acts of worship], she takes support from it.”
Rasulullaah SalAllaahu Alayhi Wasallam said, “Untie this rope. You should offer salaah when you are fresh [and energetic]. And when you get tired, you must lie down.”
(Bukhaari no. 1150. Muslim no. 219)

Rasulullaah SalAllaahu Alayhi Wasallam said, “When any of you feels sleepy while offering salaah, he should lie down so that his sleepiness goes away. When a person offers salaah in a sleepy state, it is likely that he will unwittingly swear himself instead of seeking forgiveness.”
(Bukhaari no. 212, Muslim no. 784)

To be Continued In Sha Allaah

مَوْلَاىَ صَلِّ وَ سَلِّمْ دَائِمًا أَبَداً  عَلىٰ حَبِيْبِكَ خَيْرِ الْخَلْقِ كُلِّهِمِ