Our postie has woken me up the last few mornings!! Which is very unusual as post didnt usualy come until after lunch, sometimes nearly tea-time! Ive noticed we have a different postie now though, it used to be a woman who did ours, so they obviously are just doing their route a different way round. DP says he sometimes likes to change his own route around just to vary his day
Depending on the work your postie has to do, they might do all the local businesses and schools first (as they like to get their post early), do Special Deliveries all first, then their normal post round. DP often doesnt get started his normal 4 hours (ahem, actually 6 hour IRL) post run until midday!
Then of course alot of the bigger packets will be done by a separate van, and here that used to be the job of one postie but now its shared among the ones who have a normal route, so the "packet van" usually doesnt even get going until after 2pm!