diff --git a/code/main.c b/code/main.c
index 9206c3f..d0bf789 100644
--- a/code/main.c
+++ b/code/main.c
@@ -482,8 +482,8 @@ void simple_init()
 	// Interrupt on button and rotary encoder pins
 	PCMSK = (1 << PCINT1) | (1 << PCINT3) | (1 << PCINT4);
 
-	// Interrupt type is any logical change
-	MCUCR = (1 << ISC00);
+	// Sleep mode - power down
+	MCUCR = (1 << SM1);
 
 	// Enable Interrupt on pin-change
 	GIMSK = (1 << PCIE);