If you want players to be able to use those two plugins:
Do you know how to set up a permissions system?
If not: 1. Install the plugin PermissionsEx
2. In console do: /pex user <yourname> add *
3. To add the death coords use permission type: /pex group default add deathcoordinates.teleport
4. And do /pex group default add deathcoordinates.message
5. Your default players should be able to use the death coords plugin now
6. do /pex group default add choptree.chop
7. Players should be able to chop down entire trees if you are using the choptree plugin.
Hopefully this answers your question.
I don't use the bettersleep plugin although I know what it does, unfortunately I cannot help with it.
What other plugins do you want other people to be able to use?
You will most likely have to set up a permissions system.
/pex group <group> create - Creates a group
/pex group <group> prefix <prefix> - Adds a prefix to a group (requires essentials chat and vault)
/pex group <group> suffix <suffix> - Adds a suffix to a group (also required essentials chat and vault)
/pex group <group> delete - Deletes a group
/pex group <group> users - Lists all the members in a group
/pex group <group> user add <user> - Adds someone to a group
/pex group <group> user remove <user> - Removes someone from a group
These are just some of the commands.
If you want to see all of them:
https://github.com/PEXPlugins/PermissionsEx/wiki/Commands#user-commands
You could make a scoreboard to hide players names:
/scoreboard teams add PVP
/scoreboard teams option PVP nametagVisibility always
/scoreboard teams join ACTORS <playername>
If all of the things you said are true, I see no reason for the problem to occur.
May i come have a look on the server?
And if its a survival server why do your friends have access to creative?