I am not as extreme as @Sonia Cuff being only 8 hours in front of my colleagues in Redmond, but I totally get the upset to your sleep life. I work from 4 PM my time until about 1 AM my time which is the working day for my Redmond colleagues. It was difficult to adjust to to begin with but I found over time I just switched my day about so I go see friends and do household chores during the day and then work in the evening.
I have been doing this for 10 years now and in all honesty it only ever really becomes an issue for me when I want to do something in my social life. For example, I recently joined the local Astronomical Society but their meetings are all in the evening my time. Fortunately I have a very supportive team and we were able to accommodate me effectively taking a longer lunch, so speak to your manager / team is always key.
I would say the biggest issues I face is the social isolation that is caused by basically working every night during the week and having no local colleagues. I miss the office chat and some of the psychological benefits of being able to sit down with your colleagues and just catch up. That means, as I am sure anyone in my team will attest to, I sometimes am looking for a quick catch up before or after a call that is not strictly 'work'.
Digitally separating yourself from work can be especially challenging, like @Sonia Cuff I put all my work apps into one folder that's not on my home screen. I also make sure my personal email is in my native mail client and not Outlook, so I can look at my personal email without getting sucked into a work problem. When I take a holiday I like to either go into the Highlands here in Scotland or take a cruise, basically do something that means I have no internet or it's not easy to get online. I think working with technology is also part of the reason for these 'detox' holidays.
I have always wanted the ability to tell my devices.. "For these group of apps only notify me of things between x time and x time" or get outlook to only download new work emails in my working hours. @Anna Chu and the rest of our team are also really good and making sure everyone, especially me, is striking a healthy work life balance.
I can't emphasize enough the importance of the physical separation between home and work, setting up an office or a space that is 'just work' and make sure you have set it up with a decent office chair, a desk and a room with good lighting. Because I have been doing this so long I have adjustable lighting so I can change the brightness, color or number of lights I have on.
Also if you live alone and work from home often I highly recommend a pet, great for stress and gives you some companionship, indeed great point to introduce Koby:
He helps me focus, gets me out of the house for walks and to meet people.
So @Simon Binder back to your ask, I think the best way to approach it would be to change slowly over a week, start an hour or two later every day and remember when you get to a certain point you need to get used to getting up later as its very important you get the right amount of sleep. Also I still eat at the right times for the time zone I live in, so breakfast when I get up, lunch at about 1pm and dinner at around 6pm. For the family, you need to be there for them, because we do what we do to live we do not live to work and your family must always come first. Our Children grow up fast enough and you do not get that time back. Again the separation between home and office will likely help manage this as well and, as per the person being interviewed on the BBC found out, sometimes even when working you just have to stop and deal with family life.
I hope these are helpful to you and others who work remotely either for the first time or regularly.
Working from home is super productive and, when managed well, can be a highly beneficial experience giving you more time with your loved ones and still allowing you to be productive for your employer.
Allen