It's definitely do-able, infact for me it's the perfect arrangement. I have deadlines with my work, so I don't get distracted as I know I have a lot of work to do and a deadline for it. I manage to work 6 hours a day, all while my DD is sleeping. She has a 2 hour nap in the day and then I work 7 - 11pm after she's gone to bed at night. It works for me as my husband is a chef so we're not missing out on couple time as he works nights.

Does your DS have a nap in the day? If you work while he's sleeping and then maybe an hour at night, it probably would be that bad? Good luck, I hope it all goes well