Your bird's clock is set by light, not by your schedule
Birds are built to sleep through the dark hours in one long, unbroken stretch, roughly matching the night their wild relatives know. A household that keeps late hours breaks that pattern in two ways: light and noise leaking around a cage in a living room until past midnight, and a late start the next morning that tempts everyone to let the bird sleep in and shift the whole day. The result is a chronically under-slept bird that naps in the afternoon, bites more readily, screams at dawn anyway, and slowly loses condition.
Give the bird a bedroom, not just a cover
A cage cover in a room where a television is still playing and people are crossing to the kitchen is a curtain, not a night. The reliable solution is a sleep cage: a smaller, simply furnished cage in the quietest, darkest room in the house, with water, one familiar perch and nothing exciting. Carry the bird there at the same time each evening as a calm ritual, with a few minutes of quiet talking first, so the move itself becomes the bedtime cue. In the morning, bring the bird back to its day cage at a consistent time, even on weekends, because a regular wake-up anchors the whole rhythm.
Run the wind-down in the same order nightly
Dim the bird's area, lower your voice, offer the last small piece of food or brief interaction, then make the move, cover or close the sleep room door, and leave without returning for one more check that restarts the bird's attention. Whoever is on bedtime duty follows the same short sequence, including on nights when guests or a film make the household's own evening run late. If the bird calls after lights-out, answer once softly from outside the room rather than going in with lights and conversation, which teaches that calling extends the day.
Manage mornings and daytime honestly
A bird kept up late by a household event will be tired the next day whatever you do, so let it nap briefly if it needs to, but do not shift bedtime later permanently to compensate, or the drift becomes the new pattern. Daytime naps that grow long and frequent, a bird sleeping fluffed on two feet during the day, or morning droppings and appetite changing are reasons to involve an avian vet, because sleep disturbance is also how several illnesses first appear in birds. Keep the day cage somewhere the bird can rest undisturbed at midday if the house is busy, so night sleep is not the only rest it ever gets.
Make bedtime independent of who is still up
The failure mode in late households is negotiation: the bird stays up because one person is still watching something, or gets covered at a different time by each family member. Fix the bird's bedtime as a household fixture, like locking the door, and rotate who performs it without rotating the time or the steps. Recording that fixed bedtime, the sleep-cage setup and the wind-down order in KinsLe Family Sharing lets a partner, a teenager or a housesitter put the bird to bed exactly as you would.