To get the best out of your daily blood pressure medication, take it just before you go to bed, say researchers.
It's a simple tip that could save lives, they say in the European Heart Journal.
The pills offer more protection against heart attacks and strokes when taken at bedtime rather than in the morning, a large new study suggests.
Experts believe our body's biological 'clock' or natural 24-hour rhythm alters our response to the medication.