diff --git a/src/shared/sleep-config.c b/src/shared/sleep-config.c
index 81862c776d..0e6fd41dce 100644
--- a/src/shared/sleep-config.c
+++ b/src/shared/sleep-config.c
@@ -108,12 +108,16 @@ int can_sleep_state(char **types) {
                 return true;
 
         /* If /sys is read-only we cannot sleep */
-        if (access("/sys/power/state", W_OK) < 0)
+        if (access("/sys/power/state", W_OK) < 0) {
+                log_debug_errno(errno, "/sys/power/state is not writable, cannot sleep: %m");
                 return false;
+        }
 
         r = read_one_line_file("/sys/power/state", &p);
-        if (r < 0)
+        if (r < 0) {
+                log_debug_errno(r, "Failed to read /sys/power/state, cannot sleep: %m");
                 return false;
+        }
 
         STRV_FOREACH(type, types) {
                 const char *word, *state;