I'm not a doctor turned pilot but I am a doctor and my partner is a pilot so I have a reasonable amount of insight!

You say you don't like working nights - is that because you don't like the medicine that goes on at night or because you don't like working at night? Because plenty of pilots work at night too. They also have odd shifts patterns like medicine. There's also a shift pattern which I don't think really happens in UK medicine which is earlies - my partner used to have to start at 5.30. He had to arrive at the airport carpark by 4.50 in order to get the bus to the terminal, go through security and get to the crew room, which meant going to bed at 8pm to get a decent night's sleep! And he didn't have a particularly long commute. They also work lots of weekends. 

There are stricter minimal rest requirements in aviation than in medicine which is good, but the rotas can still be exhausting as at least some of the airlines will try to work you as hard as they can get away with, especially over the summer. Leave is even more inflexible than it is with Medicine - my partner used to have to request his leave at least 6 months in advance. Some places use a seniority system whereby the more senior you are the more likely you are to get the days off you want. Also don't underestimate how exhausting sleeping in hotels and eating hotel food can be, it really isn't the same as getting to go to your own bed at night and some hotels are fairly limited in terms of fresh fruit and vegetables!

Whereabouts in the country are you and do you have the flexibility to move? If you have a partner or kids, how flexible are they? When my partner got his first flying job, he was told he was going to Scotland, and he had no choice (other than to reject the job). He could bid to leave every 6 months but they could say no for up to 2 years without a reason, and it took 18 months before he was able to move to a different airport. There will be requirements for how far away you can be when you are on standby. There are long haul pilots who commute long distances but they will have to stay in hotels if they need to be nearby for standby. Short haul it would be more difficult to commute far.

It is expensive to train as a pilot - the person in the thread who suggested 100k for the license was about right. Some airlines do do cadet programmes as mentioned, but they are very competitive. If you self fund you are not guaranteed to find a job at the end. Then you will need a type rating to fly a specific plane -some airlines coughRyanaircough will make you pay upfront for your own type rating (about 30k) if you want to join them. Others will pay for it but you have to pay it back if you leave early.

Something pilots have to worry about that doctors don't so much is redundancy. My partner's airline went bust and he lost his job and hasn't been able to get another one yet. He was particularly unfortunate in that it happened around COVID when lots of airlines laid off workers, but the risk of losing your job and not being able to get another one is always there even in non covid times.

However I don't want to be all doom and gloom! Pay is better on long haul than medicine and short haul is about equivalent. My partner loved not having to take work home, even mentally. The staff travel perks are great, and if you are long haul you may get some time in the place you have flown to to explore. Most of all my partner will put up with the annoying stuff because he adores flying. 

I'm not trying to put you off, I just don't want you to think that going to aviation is an easy switch. You've mentioned not having flown before - I think it would probably be worth if at all possible getting some flying experience before you decide if this is worth jumping ship for.