Updated sleep resistance in some spots where the partial needed check…

…ing.

src/eat.c

@@ -2567,11 +2567,12 @@ eatpill()
         exercise(A_WIS, TRUE);
         break;
     case 5:
-        if (Sleep_resistance) {
+        if (how_resistant(SLEEP_RES) == 100) {
             pline("Hmm. Nothing happens.");
         } else {
             You_feel("drowsy...");
-            nomul(-rn2(50));
+
+            nomul(-resist_reduce(rnd(50), SLEEP_RES));
             u.usleep = 1;
             nomovemsg = "You wake up.";
         }

src/muse.c

@@ -2637,12 +2637,12 @@ struct monst *mtmp;
         if (!Deaf) {
             /* No effects on you if you can't hear the music, but the monster
              * doesn't know that so it won't be prevented from trying. */
-            if (Sleep_resistance)
+            if (how_resistant(SLEEP_RES) > 90)
                 You("yawn.");
             else {
                 You("fall asleep.");
                 /* sleep time is same as put_monsters_to_sleep */
-                fall_asleep(-d(10, 10), TRUE);
+                fall_asleep(-resist_reduce(d(10, 10), SLEEP_RES), TRUE);
             }
         }
         otmp->spe--;

src/spell.c

@@ -466,7 +466,8 @@ register struct obj *spellbook;
     boolean too_hard = FALSE;
 
     /* attempting to read dull book may make hero fall asleep */
-    if (!confused && !Sleep_resistance && objdescr_is(spellbook, "dull")) {
+    if (!confused && (how_resistant(SLEEP_RES) < 50)
+          && objdescr_is(spellbook, "dull")) {
         const char *eyes;
         int dullbook = rnd(25) - ACURR(A_WIS);