The phrase "to heighten the senses" means to increase or intensify one's ability to perceive or experience things through their five senses (sight, hearing, taste, touch, and smell). Full definition
Even before nausea kicks in, some women develop an extremely - heightened sense of smell. (babymed.com)
Honestly, it's hard knowing who to trust but my favorite part about solo travel is how heightened my senses are and how present I become. (jetfarer.com)
One of the earliest sign of pregnancy is heightened senses of smell and taste. (doctor-info.website)