Wake-up appliance (200; 300) comprising: an alarm device for generating an alarm signal; a control device for controlling the operation of the alarm device, the control device having a snooze input for receiving a user input signal; wherein the control device is capable of operating in an alarm state and in a snooze state; wherein the control device is designed to activate, when operating in the alarm state, the alarm device such as to produce the alarm signal; wherein the control device is designed to make a transition, in response to receiving a user input signal at its snooze input, to the snooze state and control the alarm device such as to stop the alarm signal or reduce the signal intensity of the alarm signal, then wait for a predetermined snooze interval, and subsequently make a transition back to the alarm state and re-activate the alarm device; wherein the appliance further comprises at least one controllable light-generating device (2000; 3000) controlled by the control device, wherein said light-generating device is capable of generating light within at least a blue range of the light spectrum; and wherein the control device is designed to control, in response to receiving the user input signal at its snooze input, the light-generating device such as to increase the light intensity in at least part of said blue range; wherein said light-generating device (2000; 3000) comprises at least one first light source generating output light having a spectrum that is non-zero within at least one sub-range within said blue range of the light spectrum; and wherein the control device is designed to increase, in response to receiving the user input signal at its snooze input, the light intensity of said first light source; wherein said light-generating device (2000; 3000) further comprises at least one second light source (450; 650R, 650G) controlled by the control device independently of said first light source. an alarm device for generating an alarm signal; a control device for controlling the operation of the alarm device, the control device having a snooze input for receiving a user input signal; wherein the control device is capable of operating in an alarm state and in a snooze state; wherein the control device is designed to activate, when operating in the alarm state, the alarm device such as to produce the alarm signal; wherein the control device is designed to make a transition, in response to receiving a user input signal at its snooze input, to the snooze state and control the alarm device such as to stop the alarm signal or reduce the signal intensity of the alarm signal, then wait for a predetermined snooze interval, and subsequently make a transition back to the alarm state and re-activate the alarm device; wherein the appliance further comprises at least one controllable light-generating device (2000; 3000) controlled by the control device, wherein said light-generating device is capable of generating light within at least a blue range of the light spectrum; and wherein the control device is designed to control, in response to receiving the user input signal at its snooze input, the light-generating device such as to increase the light intensity in at least part of said blue range; wherein said light-generating device (2000; 3000) comprises at least one a control device for controlling the operation of the alarm device, the control device having a snooze input for receiving a user input signal; wherein the control device is capable of operating in an alarm state and in a snooze state; wherein the control device is designed to activate, when operating in the alarm state, the alarm device such as to produce the alarm signal; wherein the control device is designed to make a transition, in response to receiving a user input signal at its snooze input, to the snooze state and control the alarm device such as to stop the alarm signal or reduce the signal intensity of the alarm signal, then wait for a predetermined snooze interval, and subsequently make a transition back to the alarm state and re-activate the alarm device; wherein the appliance further comprises at least one controllable light-generating device (2000; 3000) controlled by the control device, wherein said light-generating device is capable of generating light within at least a blue range of the light spectrum; and wherein the control device is designed to control, in response to receiving the user input signal at its snooze input, the light-generating device such as to increase the light intensity in at least part of said blue range; wherein said light-generating device (2000; 3000) comprises at least one first light source generating output light having a spectrum that is non-zero within at least one sub-range within said blue range of the light spectrum; and wherein the control device is designed to increase, in response to receiving the user input signal at its snooze input, the light intensity of said first light source; wherein said light-generating device (2000; 3000) further comprises at least one second light source (450; 650R, 650G) controlled by the control device independently of said first light source. and wherein the control device is designed to increase, in response to receiving the user input signal at its snooze input, the light intensity of said first light source; wherein said light-generating device (2000; 3000) further comprises at least one second light source (450; 650R, 650G) controlled by the control device independently of said first light source.