In Jain Dharma, the emphasis is on purity of mind and body when doing sacred activities like puja or meditation. After any intimate activity at night, you should:

• Wash thoroughly and refresh yourself to regain physical cleanliness.
• Calm the mind and approach the puja with sincerity, honesty, and a respectful intention.
• If you follow a personal or community rule (Digambar or Śvetāmbara) about purification rituals, adhere to that guidance, but there is no universal ban on performing puja in the morning after such an act.

Key point: the essential aim is cleansing of body and mental purity before worship. If you are unsure about the specific rules for your tradition, consult your Jain guru or local śrāmaṇi to confirm the appropriate practice for you.