I don't think you should...
You ought to..
I suggest you keep early hours from now on.
A: Are you feeling better today, Steven?
B: Much better. But I am still coughing at night.
A: You should take advice from your doctor to quit smoking. It's bad for your health.
B: It doesn't matter. I'm sure I'll be all right in a few days. Just like I got sick last time, I still got better even if I smoke.
A: That's because you weren't seriously ill last time. But this time, the doctor has made it clear to you not to smoke.
B: Easier said than done. I'm a heavy smoker and it's really hard for me to quit smoking now.
A: Not that hard. You can make it if you make up your mind.
B: Actually, I tried it a long time ago, but it all ended in failure.
A: But this time is different. You're working for your health. You have a goal.
B: But you know, I often stay up late and smoking keeps me awake.
A: Why didn't you go to bed earlier?
B: I've been busy with a project recently. And one week is the deadline. I have to finish it during this time.
A: You will have plenty of time after this, so you'd better go to bed and get up early by then.
B: You are right. I should change my habits. I'll give it a try. Thank you.
A: I hope you can get better soon and quit smoking successfully.