At 100ml my bladders irritated&wants to be emptied, but I sleep through the night and can hold it. It doesnt hurt when I wake up. Whats wrong?

Bladder irritants. If you haven't already, see your doctor to rule out a urinary tract infection and a condition known as interstitial cystitis that can cause the symptoms you are having. In the meantime avoiding certain foods and drinks can help. Here is more info; http://www.hopkinsmedicine.org/johns_hopkins_bayview/_docs/medical_services/obstetrics_gynecology/bladder_irritants.pdf http://www.mayoclinic.org/diseases-conditions/interstitial-cystitis/basics/definition/con-20022439.