Have You recorded your BP on digital machine??
If yes than relax it can be a error.
You need to monitor your BP twice daily for 7 days.
Sometimes sudden slike can be due to stress, lack of sleep, disturbed sleep and there are many other factors.
Next Steps
kindly connect on practo app for further management.
Health Tips
kindly visit your family physician to record your BP through manual machine twice daily for 7 days.