Any mommies been through this?

My almost 6 month old bb will cry in the middle of his sleep at night if we had brought him out in the day .. when we stay home the whole day he won't have this issue and will sleep very soundly. 1st to 5th month we have been constantly gng out quite often, no issue too.. after the 5th month our outings lessen to twice a week.. and we realised this is happening ..