1) Don't write "is ___ing" anything. If you write "Dave Smith is thinking that dwarves are sexy", just change it to "Dave Smith thinks dwarves are sexy".
2) Don't tell us that you're eating or sleeping. These are things that everyone does already and uninteresting to boot. Tell us that you shot a pheasant today, or heard someone having sex next door, or cracked the Da Vinci code and are now flying to Paris.
3) It's ok to mention how you feel: this is interesting to others since people often keep their emotions behind locked door(s).
4) If you don't have anything interesting to say, it's ok not to say anything at all!