A glass of warm milk can help insomnia and anxiety, which can exacerbate feelings of sadness.  10 Avoid alcoholic beverages and drugs. It’s advisable to avoid all alcohol and…
4 Ways to Stop Being Sad - wikiHow
First, don’t feel bad about feeling sad. When something negative happens in your life, it can seem like your world is ending. But instead of suppressing or dismissing your emotions—either by distracting yourself or keeping up a good front—you should actually embrace them.
Can't pinpoint why you're sad? Try writing. Sometimes it's easy to pinpoint the reason you feel upset―say, if you just can't get over your ex, you bombed your big work presentation, or you had a major fight with your partner.
Embrace your emotions. As we mentioned earlier, when you avoid sadness altogether, you’re actually doing more harm than good. “You can’t heal what you don’t feel,” says life coach and author Nancy Levin.
To release sad emotions, don't overlook the value in a good cry. Alternatively, you could also try "crashing," which is something Levin does when she's sad.
11 Ways to Stop Feeling Sad Right Now - Oprah Daily
Feeling sad for no reason is not uncommon, but it can be a sign of depression, which is when the sadness is persistent and does not seem to improve. Common signs of depression include rapid shifts in mood, seasonal sadness, and anxiety or emptiness. To cope with depression, it is important to talk to someone you trust and get support right away, as it can help to identify the cause and manage the symptoms.
Why Am I Sad for No Reason? What Might Be Happening - Healthline