Why do mosquito bites apparently itch in a 24-hour rhythm?

Mosquito bites itch because the mosquito saliva sensitizes your immune system and the allergic inflammation to it continues for a week or two after the bump first appears.

Normal cortisol production follows a diurnal cycle. Levels peak in the early morning hours (6 am–8 am) and decline throughout the day with a second, lower peak in the late afternoon (4 pm–6 pm).

Production of corticosteroids by your body follows a 24 hour cycle. Around 4 am your body starts pumping out more corticosteroids (to help you with the stress of getting up) and by 8 am your corticosteroid level is pretty high. At this time, mosquito bites or even poison Ivy won't itch very much. However, by 4 pm your corticosteroid levels will have gone down enough to release the allergic inflammation from being inhibited by the steroids. The corticosteroid levels will continue to drop and by 8 - 10 pm the itching will be most intolerable.

The circadian rhythm of cortisol levels influences your feeling of well-being, the levels of white blood cells in your blood and any inflammatory conditions you are suffering from. This cycle can be influenced by your patterns of sleep and your exposure to sunlight and darkness.

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I dont want to alarm you, but it is possible that you may have aquired a slight infection by some sort of parasite. Many insect borne infections work on the biological and behavioural cycle of their hosts and their sesceptibility to the vector, in this case the mosquito. Many parasites, Malaria being one will only cause symptoms at various parts of the day, this directly corresponds with the peak in activity of the Anopheles mosquito which is the vector. In order for the parasite to be transmitted, it has to be found in the bloodstream when the mosquitoes are feeding, so they begin to emerge in the blood stream around dusk, when the prime time for mosquitoes is occuring. It may be nothing severe in your case, but if the cycle continues for more than a couple of days, you might want to go see a doctor. Mosquito bites typically cause itchiness and redness due to the alien chemicals they inject into the blood stream, these are a mild anesthetic and an anticoagulant. Each person will rect differently, some people have a severe breakout, while others wont ever even know they were bitten. It is quite possible that your reaction is more periodic than constant. I hope this helps, Im not trying to scare you.....

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RE:

Why do mosquito bites apparently itch in a 24-hour rhythm?

seems like they don't itch during the daytime, but at night, especially around the time when you received them. or is this a psychological phenomenon?

mosquito try to avoid direct sunlight,thatswhy they try to hide themselves from sunlight during daytime,they hide corners of room or in clothes,when day ends(7 oclock pm)they become hungry and comes out freely.i can say that this phenomenon is rhythem

they itch due to the saliva left behind.

because of the poision the female leaves in you it blocks the blood so it can get its food.