While you were lying in bed early this morning, you realized that your respiratory rate was slower and you knew that means that your blood CO2 levels are
falling, blood [H+] are also decreasing along with decreasing blood pH.
rising, blood [H+] are falling and blood pH levels are decreasing.
rising, your blood [H+] are increasing, and your blood pH levels are decreasing
falling blood [H+] are rising while blood pH levels are also rising