Computer awakens in nigh midnight hours.

The spirit of my machine occasionally stirs in the darkest hours and the screen lights up. It is my grandfather's computer and is older than me.

It stirs awake with an unforgettable whir and the screen lights up. The ancient runes of the old one's technology become luminous once more, then retreat into the darkness in the shadow of night.

Why does the computer awaken so late and spontaneously? It has a consistent yet enegmatic schedule of arising at 11:30 pm on any given day. It's motive is unknown. Will I need a mechanical priest (IT guy) or is this rectifiable?