Alternative approach using the invoke magic call.

UseCaseInvoke.php

<?php

/**
 * We are used to create Commands/UseCases with a single method,
 * is very common to create the name of the method with `execute` 
 *  `$doSomething->execute($thisDay)`
 * or to create the method name repeating the expressive class name:
 *  `$doSomething->doSomething($thisDay)`.
 * 
 * This gist uses the magic call invoke 
 * in order to be more expressive:
 *  `$doSomething($thisDay)`
 */
class DoSomethingThisDay
{
    public function __construct($collaborator)
    {
       // ... store collaborators into vars
    }

    /**
     * @param DayCommand $thisDay
     *
     * @return ActionView
     */
    public function __invoke(DayCommand $thisDay)
    {
        $you = You::createWithLazyBeing();

        if ($thisDay->isRainyDay()) {
            $you->doSleep();

            return new ActionView("sleep");
        }

        $you->watchTelevision();
        return new ActionView("tv");
    }
}

$thisDay = Day::createARainyDay();
$collaborator = // something like a factory, service repository...

$doSomething = new DoSomethingThisDay($collaborator);

echo $doSomething($thisDay);