A larger round display, a sunrise-style screen, and an alarm that senses light sleep come with the $199.99 Echo Time. The Echo Spot is $109.99.

A bright, razor‑sharp alarm crackles into frame, drawing the ear’s attention with a gleaming metallic trill that slices cleanly across any surrounding quiet. The initial burst is sharp enough to feel ...

An alarm clock may seem outdated, with your smartphone’s endless number of tones and apps to wake you up. But using your phone as your alarm can tempt you to use it before you tuck in, and that can ...