Develop rituals and have a disciplined way of managing the day.
Schedule a start and an end time.
Have a rhythm.
Take a shower, get dressed, even if it’s not what you’d usually wear to work, then get started on the day’s activities.
If you’re used to moving physically, make sure you build that into your day.
If you’re an extrovert and accustomed to a lot of contact and collaboration with others, make sure that still happens.
Ask yourself:  How will I protect myself from feeling lonely or isolated and stay healthy, productive, and vibrant?
Create that for yourself.

Read more here.