In Jain tradition, adhivāsan and añjana-śalākā are often done after midnight or in the early pre-dawn hours because that time is considered very pure, quiet, and less disturbed.

Main reasons:

1. Auspicious muhūrta

These rites are performed in a spiritually suitable time. In many traditions, the late-night / pre-dawn period is considered favorable for sacred ceremonies.

1. Purity and stillness

The atmosphere is calmer, with fewer worldly activities, so the mind can remain more focused on devotion, mantra, and ritual purity.

1. Protection from distractions

These ceremonies are delicate and sacred. Doing them at a quiet hour helps maintain concentration and reverence.

1. Tradition and ritual discipline

In many Jain practices, the timing is fixed by āgamic and paramparā-based custom, so the ceremony is done exactly as prescribed.

1. Spiritual symbolism

The transition from night to dawn is often seen as a movement from darkness toward light, which suits consecration and sanctification rites.

So, it is not merely because it is “midnight,” but because that period is regarded as the most suitable sacred time for such rites.

If you want, I can also explain the difference between adhivāsan and añjana-śalākā in simple Jain terms.