I've just been prescribed Travatan for glaucoma, and since it is to be used in the evening and I live alone, I am concerned that if I did have an adverse reaction to it, it would occur in the middle of the night. Is this logical, or would I generally have to use it for a long period of time for serious side effects to manifest themselves? (I tend to be hypersensitive to many medications & just had to discontinue an antibiotic ointment prescribed for blepharitis due to worsening of the eye irritation.)