Tea before sleep, how does it help?

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Actually I am not fond of tea (as Filipinos naturally don't have tea on our breakfast table, we have Cocoa). Most of the time, to help me ease out constipation, I drink tea at night using it as laxative especially the Senna leaves ones. Now that I am okay and I don't like the effect of Senna leaves (but haven't tried like English breakfast tea), because it makes me uneasy at work coz anytime it would just call you for a toilet prompt anytime during the day and this is so uncomfortable especially when you're at work, so I'd like to ask for some opinions if I'd just want to ease out a stressful day from work what's the best tea for me to take before bedtime? Coz for sure it wouldn't be the "breakfast" tea?