diff --git a/src/Sleep.php b/src/Sleep.php
index e89841e..dc8dd56 100644
--- a/src/Sleep.php
+++ b/src/Sleep.php
@@ -134,12 +134,12 @@ public static function for($duration)
     /**
      * Sleep until the given timestamp.
      *
-     * @param DateTimeInterface|int $timestamp
+     * @param DateTimeInterface|int|float|numeric-string $timestamp
      * @return static
      */
     public static function until($timestamp)
     {
-        if (is_int($timestamp)) {
+        if (is_numeric($timestamp)) {
             $timestamp = Carbon::createFromTimestamp($timestamp);
         }