It's very hard and very tiring. Being a parent isn't always easy without adding single and working to the mix. Up until mid last yr when I had DD2 I was working 3-4 days a week and 3-4 nights a week (usually I worked the nights I worked the days). It was really tough on me and especially my kids who would be at daycare day, my parents at night if I couldn't get someone to come and watch them at my house till I got home. I worked all wkend, all day then night so my parents pretty much had my kids of a wkend . I hated doing it and felt guilty but the single parent pension didn't really cut it. I was also pregnant so when I did get a day off all I wanted to do was rest.... More guilt cause I wasn't as active with the kids like I should have been.
My kids would go to their fathers one week every 4th week (we live 4hrs apart). So that week I didnt have to rush around after them but I didn't get to see them at all.
Now I have had DD2 and her father and I are back together so I'm able to stay at home though I still do the odd night shift.