For how many years did Laxman not sleep?

 Lakshman didn't sleep for the entire fourteen years of their exile. He had an agreement with his wife Urmila under which Urmila took his share of sleep so that Lakshman could serve and protect his brother, lord Ram and sister-in-law, mother Sita without getting tired.

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Nidra Devi: The Goddess of Sleep and Fatigue

 Have you ever heard of the Hindu goddess Nidra Devi? In ancient Hindu scriptures, Nidra Devi is revered as the deity of sleep. She is believed to be a manifestation of Parvati and is wedded to Kalagnirudra, a form of Rudra, or Shiva.

She is mentioned in the Rig Veda and various other ancient Hindu texts. Described as a loving mother and a bestower of spiritual strength, she possesses beauty akin to that of Goddess Lakshmi and embodies the combined powers of the Tri-Devis—Parvati, Lakshmi, and Saraswati.

Nidra Devi holds great significance for those who struggle with sleeplessness, fatigue, lack of energy, and mental challenges.

In the Ramayana, there's a story where Lakshman, devotedly serving Rama for 14 years, didn't sleep at night. To ensure her husband's well-being, his loving wife Urmila slept in his place for the entire duration, blessed by goddess Nidra Devi herself.