For an adult male resting heart rate ranges from 60 to 100 and yours is still under normal range.Yours feels like higher due to any minor reasons like stress,anxiety,recent physical exercise,mild inflammation etc
During sleep,your harmone,muscle activity,anxiety everything gets reduced hence less than 80 is completely normal
Next Steps
-Start regular mild physical exercise
-sleep and wake at fixed time
-drink adequate water
-have balanced nutrition
You can seek medical attention if you have following symptoms
-resting heart rate or sleep heart rate exceeds 100
-chest pain,breathlessness,excessive sweat
Health Tips
Contact me anytime on practo for further consultation