I'm tired, i go to bed now vs I'm tired, i am going to bed now

Some examples from the web:

• All right, I'm going to go to bed now.
• Papa, I'm ready to go to bed now.
• Can I go to bed now?
• - May I go to bed now?
• Can I go to bed now?
• Dre, I'm so tired, and I want to go to bed, but I can't go to bed when I'm this mad at you.
• Doctor, when I go to bed, I'm always short of breath.
• I mean, I'm only taking the narcotics you prescribed before I go to bed, so...
• So, I think we go to bed now.
• Ian, love, I'm going to bed now.
• Uncle Hale, I'm going to bed now.
• Can-can i go to bed now?
• - May I go to bed now?
• Can - can I go to bed now?
• I'm very tired, it's very late, I'm going to go to bed.
• I'm tired, I'll be off to bed.
• - I'm pretty tired, Is it okay if I just go to bed?
• Hyeon Yi, you should go to bed now.
• You should go to bed now.
• He can go to bed now, Pettigrew.

Some examples from the web:

• But in the meantime, I am going to bed.
• I am going to bed now,
• I am going to bed. illykillyk.
• Now, y'all can go back to ignoring me because now I am going to bed.
• So long as I'm in town, I am going to sleep between you and him.
• So just to let you know, I'm real sorry about that whole Meredith thing, But I am going to... take care of it.
• I'm so sure, I am going to go with you to that reunion.
• Look, I'm really sorry for what you've been through, but I am going to have to take you both in.
• Okay, while I'm on bed rest, I am going to need your attention 24 hours a day, eight days a week.
• If I am going to talk to these guys, I'm going to need some play money.
• Okay, I'm going to find these papers that you need, but then I am going to organize the rest of this stuff.
• Now, I am going to the police this minute and I'm going to make a formal complaint against both of you.
• Finish your coffee, I am going back to bed.
• Soon as I'm pregnant, I am going to be one of the most famous people on the planet.
• I am going to go do rounds with my interns, and then afterwards, I'm getting brunch with Peter.
• I'm saying, Chris, I am going to make sure that you grow up to be a success.
• So just to let you know, I'm real sorry about that whole Meredith thing, But I am going to... take care of it.
• I am going to be doing a thing, I'm not sure what yet, whereby that 25% will receive either a little visit from me, or a jumper.
• I'm here to say goodbye very quickly, I am going to visit my dad, my mum...
• I'm here to let you know that, this week, I am going to obliterate you.