If I wear a tallit katan during the day and also to bed, can I wear the same one during the day and also to bed? Or must the one I wear to bed be a different one than the one I wore during the day?
Also, if this changes anything, I'm Sephardic.
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Per Chabad.org one should wear a different pair at night, in order to be a ble to make a Bracha on the Tzitzis in the morning.
If one wears tzitzit while sleeping, it is preferable to have "night tzitzit." Otherwise, if one wears the same pair of tzitzit night and day, reciting the blessing on the tzitzit in the morning is problematic, for a new mitzvah is not being performed—it is merely a continuation of the mitzvah from the day beforehand. However, when putting on a different pair of tzitzit in the morning there is no problem with saying the blessing on the new pair—new mitzvah.
you do not need to wear a tallit katan while sleeping. The mitzvah only applies during the day. This is what is refer to as a Mitzva Aseh SheHazman Grama (positive time bound commandment) On the other hand there are those who still wear there tzitzis at night time either all of the time or at least when sleeping in a place without a mezzuzah.
If one chooses to wear their tallis katan at night time it is important to differentiate between the one worn at night (which isn't obligatory) and the one worn during the day by having a separate tallis katan only worn at night time or at least a different on than the one you will wear during that day