When Can I Say Goodnight to Insomnia?

How long can you stand awake at night? How many nights can you stay up with no sleep?  Insomnia is getting my way again and is killing me. I am so tempted to have some coffee today but I skip. I contented myself with calming  tea but if insomnia  persists, I might consider seeing a doctor for some sedatives. It's not the first time I ask a professional help for this illness. I can't stand again for another night of sleepless misery. There are times when I can sleep so deep.  I know I can beat it and I'll be going back to my normal sleep routine but how long can I take this?  When can I finally say goodnight to insomnia?