Answer

In Jain Dharma, especially on the last day of Paryushan and while doing upvas, it is best not to masturbate.

Paryushan is a time for samyam — self-control, purity of thoughts, and reducing attachment to body and desires. Since you have already done upvas today, try to complete the day with restraint and devotion.

What you can do instead

If you cannot sleep, try:

• Chanting Navkar Mantra slowly and peacefully
• Doing Pratikraman bhavna or asking forgiveness in your heart
• Sitting quietly and taking slow breaths
• Reading or listening to Jain stavan, sutra, or pravachan
• Lying down without forcing sleep; just rest the body calmly

Spiritual Understanding

Desires become stronger when we give them too much attention. Jain Dharma teaches that real strength is not only fasting from food, but also trying to control the senses and passions.

Even if the urge feels strong, it will pass. If you remain patient, your upvas and Paryushan observance will feel spiritually more complete.

Takeaway

Try not to do it today. Offer this difficulty as part of your tapas and samyam. Chant Navkar Mantra calmly and let the mind settle.