 This threat is called "artificial light pollution at night" , or ALAN. ALAN takes a substantial toll on avian sleep since it eliminates darkness, a key component for rest.
<clarity>  This threat is called "artificial light pollution at night" , or ALAN. ALAN takes a substantial toll on avian sleep since it eliminates darkness, a key component for rest.
 This threat is called "artificial light pollution at night" (ALAN). ALAN eliminates darkness, a key component for rest.