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Illumination/lighting change is challenging for image-based localization. The visual features can be very different between night and day. If you have a LiDAR, rtabmap could still localize when visual localization is not working for a short time. Another solution could be to map another time at night time, so you can localize either in the "night" map or the "day" map. If some places have similar lighting between day and night and rtabmap is able to visually find a loop closure, rtabmap would be able to merge the maps together (so no need to switch manually between day and night maps).
cheers
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